<SEC-DOCUMENT>0001213900-18-010717.txt : 20180919
<SEC-HEADER>0001213900-18-010717.hdr.sgml : 20180919

<ACCEPTANCE-DATETIME>20180810163247

<PRIVATE-TO-PUBLIC>

ACCESSION NUMBER:		0001213900-18-010717

CONFORMED SUBMISSION TYPE:	S-3

PUBLIC DOCUMENT COUNT:		5

FILED AS OF DATE:		20180810

DATE AS OF CHANGE:		20180918


FILER:


	COMPANY DATA:	

		COMPANY CONFORMED NAME:			SG BLOCKS, INC.

		CENTRAL INDEX KEY:			0001023994

		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-LUMBER & OTHER CONSTRUCTION MATERIALS [5030]

		IRS NUMBER:				954463937

		STATE OF INCORPORATION:			DE

		FISCAL YEAR END:			1231



	FILING VALUES:

		FORM TYPE:		S-3

		SEC ACT:		1933 Act

		SEC FILE NUMBER:	333-226787

		FILM NUMBER:		181009276



	BUSINESS ADDRESS:	

		STREET 1:		195 MONTAGUE STREET, 14TH FLOOR

		CITY:			BROOKLYN

		STATE:			NY

		ZIP:			11201

		BUSINESS PHONE:		(646) 240-4235



	MAIL ADDRESS:	

		STREET 1:		195 MONTAGUE STREET, 14TH FLOOR

		CITY:			BROOKLYN

		STATE:			NY

		ZIP:			11201



	FORMER COMPANY:	

		FORMER CONFORMED NAME:	CDSI HOLDINGS INC

		DATE OF NAME CHANGE:	19990114



	FORMER COMPANY:	

		FORMER CONFORMED NAME:	PC411 INC

		DATE OF NAME CHANGE:	19961001



</SEC-HEADER>

<DOCUMENT>
<TYPE>S-3
<SEQUENCE>1
<FILENAME>fs32018_sgblocksinc.htm
<DESCRIPTION>REGISTRATION STATEMENT
<TEXT>
<HTML>
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     <TITLE></TITLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>As
filed with the Securities and Exchange Commission on&nbsp;August 10, 2018</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Registration
No. 333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P>

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 0; margin-bottom: 0"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>UNITED
STATES</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SECURITIES
AND EXCHANGE COMMISSION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Washington,
DC 20549</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>FORM
S-3</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>REGISTRATION
STATEMENT UNDER THE SECURITIES ACT OF 1933</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>SG
BLOCKS, INC.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Exact
name of registrant as specified in its charter)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 8pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 49%; font: 10pt Times New Roman, Times, Serif; padding-top: 0; padding-right: 0; border-bottom: Black 1.5pt solid; padding-left: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Delaware</B></FONT></TD>
    <TD STYLE="width: 2%; text-align: center; padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="width: 49%; font: 10pt Times New Roman, Times, Serif; padding-top: 0; padding-right: 0; border-bottom: Black 1.5pt solid; padding-left: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>95-4463937</B></FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: center"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(State
or other jurisdiction of<BR>
&nbsp;incorporation or organization)</FONT></P></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: center"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(I.R.S.
Employer<BR>
Identification No.)</FONT></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>195
Montague Street, 14th Floor</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Brooklyn,
NY 11201</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(646)
240-4235</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Address,
including zip code, and telephone number, including</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;area
code, of registrant&rsquo;s principal executive offices)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Paul
M. Galvin</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SG
Blocks, Inc.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>195
Montague Street, 14th Floor</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Brooklyn,
NY 11201</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(646)
240-4235</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Name,
address, including zip code, and telephone number, including area code, of agent for service)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>Please
send copies of all communications to:</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>David
D. Watson</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Thompson
Hine LLP</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>3900
Key Center, 127 Public Square</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Cleveland,
Ohio 44114-1291</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(216)
566-5598</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Approximate
date of commencement of proposed sale to the public:</B> From time to time after the effective date of this registration statement.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please
check the following box. &#9744;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under
the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check
the following box. &#9746;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please
check the following box and list the Securities Act registration statement number of the earlier effective registration statement
for the same offering. &#9744;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list
the Securities Act registration statement number of the earlier effective registration statement for the same offering. &#9744;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become
effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. &#9744;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register
additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following
box. &#9744;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Indicate
by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting
company, or an emerging growth company. See the definitions of &ldquo;large accelerated filer,&rdquo; &ldquo;accelerated filer,&rdquo;
&ldquo;smaller reporting company,&rdquo; and &ldquo;emerging growth company&rdquo; in Rule 12b-2 of the Exchange Act.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 55%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Large accelerated filer &#9744;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 5%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 40%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accelerated filer &#9744;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Non-accelerated filer &#9744; (Do not check
    if a smaller reporting company)</FONT></TD>
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Smaller reporting company &#9746;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Emerging growth company &#9744;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for
complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.
&#9744;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 8pt"></FONT>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CALCULATION
OF REGISTRATION FEE</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Title
of Each Class of Securities To Be Registered</B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Amount to be</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;Registered(2)</B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Proposed</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;Maximum</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;Offering Price</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;Per Unit</B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Proposed</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;Maximum</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;Aggregate Offering</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Price</B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Amount of</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;Registration Fee</B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 52%">Common stock, par value $0.01 per share</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 9%; text-align: right">622,726</TD><TD STYLE="width: 1%; text-align: left">(1)</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 9%; text-align: right">5.01</TD><TD STYLE="width: 1%; text-align: left">(3)</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 9%; text-align: right">3,119,857.26</TD><TD STYLE="width: 1%; text-align: left">(3)</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 9%; text-align: right">388.42</TD><TD STYLE="width: 1%; text-align: left">(3)</TD></TR>
</TABLE>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Represents
    shares of common stock, par value $0.01 per share (the &ldquo;Common Stock&rdquo;) of SG Blocks, Inc. (the &ldquo;Company&rdquo;),
    offered by Hillair Capital Investments L.P. (the &ldquo;Stockholder&rdquo;).</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">This
    registration statement also relates to an indeterminate number of shares of Common Stock of the Company that may be issued
    upon stock splits, stock dividends or similar transactions in accordance with Rule 416 of the U.S. Securities Act of 1933,
    as amended (the &ldquo;Securities Act&rdquo;).</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Estimated
    solely for the purpose of calculating the registration fee pursuant to Rule 457(c), based upon the average of the high and
    low prices for the Common Stock of the Company as reported on the Nasdaq Capital Market (&ldquo;Nasdaq&rdquo;) on August 8,
    2018.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>The
registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until
the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become
effective in accordance with Section 8(a) of the Securities Act of 1933 or until this registration statement shall become effective
on such date as the Commission, acting pursuant to said Section 8(a), may determine.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; color: red">The information in this prospectus
is not complete and may be changed. The Stockholder may not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and is not soliciting
an offer to buy these securities in any state where the offer or sale is not permitted.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; color: red">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; color: red"><B>SUBJECT TO COMPLETION, DATED
AUGUST 10, 2018</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>PROSPECTUS</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>SG
BLOCKS, INC.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>622,726
SHARES</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>COMMON
STOCK</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">This
prospectus relates to resale from time to time of up to 622,726 shares of our Common Stock by the Stockholder, as described in
the section entitled &ldquo;The Stockholder&rdquo; on page&nbsp;5 of this prospectus, and its donees, pledgees, transferees or
other successors-in-interest.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Stockholder identified in this prospectus, or its donees, pledgees, transferees or other successors-in-interest, may, from time
to time, offer and sell the shares of Common Stock through public or private transactions, at prevailing market prices, at prices
related to prevailing market prices or at privately negotiated prices, as described in the section entitled &ldquo;Plan of Distribution&rdquo;
on page 7 of this prospectus. The registration of the shares of our Common Stock covered by this prospectus does not necessarily
mean that any of our Common Stock will be sold by the Stockholder. We will not receive any proceeds from the resale of Common
Stock from time to time by the Stockholder, but we have agreed to pay certain registration expenses.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
Common Stock is listed on the Nasdaq Capital Market under the symbol &ldquo;SGBX.&rdquo; On August 8, 2018, the last reported
sale price of our Common Stock was $4.94 per share.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>INVESTING
IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD CONSIDER CAREFULLY THE RISKS DESCRIBED IN &ldquo;RISK FACTORS&rdquo;
BEGINNING ON PAGE&nbsp;3 OF THIS PROSPECTUS AND ANY SIMILAR SECTION CONTAINED IN THE APPLICABLE PROSPECTUS SUPPLEMENT AND INFORMATION
INCLUDED AND INCORPORATED BY REFERENCE BEFORE PURCHASING ANY OF THE SHARES OFFERED BY THIS PROSPECTUS.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Neither
the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or
determined if this prospectus if truthful or complete. Any representation to the contrary is a criminal offense.&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>The
date of this prospectus is</B> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>, 2018.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><A NAME="toc"></A>TABLE
OF CONTENTS</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>



<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: rgb(204,238,255)">
    <TD STYLE="width: 92%; text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ABOUT
    THIS PROSPECTUS</FONT></A></TD>
    <TD STYLE="width: 8%; text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">1</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: White">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">SPECIAL
    NOTE REGARDING FORWARD-LOOKING INFORMATION</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">1</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">PROSPECTUS
    SUMMARY</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">2</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: White">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">RISK
    FACTORS</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">3</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">USE
    OF PROCEEDS</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">3</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: White">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DESCRIPTION
    OF TRANSACTIONS WITH THE STOCKHOLDER</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">3</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_007"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">THE
    STOCKHOLDER</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">5</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: White">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_008"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">PLAN
    OF DISTRIBUTION</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">7</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_009"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">LEGAL
    MATTERS</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">8</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: White">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_010"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">EXPERTS</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">8</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_011"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">WHERE
    YOU CAN FIND ADDITIONAL INFORMATION</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">9</TD></TR>
<TR STYLE="text-align: left; vertical-align: bottom; font: 10pt Times New Roman, Times, Serif; background-color: White">
    <TD STYLE="text-align: left; padding: 0; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><A HREF="#a_012"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">INFORMATION
    INCORPORATED BY REFERENCE</FONT></A></TD>
    <TD STYLE="text-align: center; padding: 0; font: 10pt Times New Roman, Times, Serif">10</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt"><A HREF="#toc">Table of Contents</A></P></DIV>
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<DIV STYLE="padding: 5pt; border: Black 1.5pt solid; width: 98%">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>




<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_001"></A>ABOUT
THIS PROSPECTUS</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
and the Stockholder have not authorized anyone to provide any information other than that contained or incorporated by reference
in this prospectus or in any free writing prospectus prepared by or on behalf of us or to which we have referred you. We take
no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you.
We are not making an offer of these securities in any state where the offer is not permitted. You should not assume that the information
contained in or incorporated by reference in this prospectus or any prospectus supplement or in any such free writing prospectus
is accurate as of any date other than their respective dates.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">You
should read this prospectus and the information incorporated by reference carefully before you invest in our Common Stock. Such
documents contain important information you should consider when making your investment decision. See &ldquo;Information Incorporated
by Reference.&rdquo; You should rely only on the information provided in this prospectus or documents incorporated by reference
in this prospectus. We have not authorized anyone to provide you with different information.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
information in this document may only be accurate on the date of this document. You should assume that the information appearing
in this prospectus is accurate only as of the date on the front cover of this prospectus. Our business, financial condition, results
of operations and prospects may have changed since that date.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Unless
the context otherwise requires, the terms &ldquo;SG Blocks,&rdquo; &ldquo;Company,&rdquo; &ldquo;we,&rdquo; &ldquo;us&rdquo; and
&ldquo;our&rdquo; refer to SG Blocks, Inc. and its subsidiaries.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_002"></A>SPECIAL
NOTE REGARDING FORWARD-LOOKING INFORMATION</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Securities and Exchange Commission (the &ldquo;SEC&rdquo;) encourages companies to disclose forward-looking information so that
investors can better understand a company&rsquo;s future prospects and make informed investment decisions. This prospectus contains
such &ldquo;forward-looking statements&rdquo; within the meaning of Section 27A of the Private Securities Litigation Reform Act
of 1995. These statements may be made directly in this prospectus, and they may also be made a part of this prospectus by reference
to other documents filed with the SEC, which is known as &ldquo;incorporation by reference.&rdquo;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company cautions that forward-looking statements involve risks and uncertainties, and actual results could differ materially from
those expressed or implied in these forward-looking statements or could affect the extent to which a particular objective, projection,
estimate or prediction is realized. Factors that could cause or contribute to such differences include, but are not limited to:
general economic and financial conditions; our ability to generate income, effectively manage our growth and realize our backlog;
competition in the markets in which we operate; the fluctuations in prices of the products we procure or distribute; availability
of raw materials; the consolidation of our industry; our ability to adapt our products and services to industry standards and
consumer preferences; our ability to expand into new geographic markets; product shortages and potential loss of relationships
with key suppliers or subcontractors; the seasonality of the commercial and residential construction markets; the loss or potential
loss of any significant customers; exposure to product liability and various other claims and litigation; our ability to attract
and retain key employees; the credit risk from our customers; our ability to obtain additional financing on acceptable terms,
if at all, or to obtain additional capital in other ways; an impairment of our goodwill; the impact of federal, state and local
regulations, including changes to export laws and tax regulations; the cost of compliance with environmental, health and safety
laws and other local building regulations; a disruption or breach in our information technology systems; natural or man-made disruptions
to our facilities and project sites; our ability to comply with the requirements of being a public company, including Nasdaq Capital
Market listing requirements; fluctuations in the price of our common stock, including decreases in price due to sales of significant
amounts of stock; and other factors discussed in &ldquo;Risk Factors&rdquo; and elsewhere in this prospectus, as well as in our
other filings with the SEC. In some cases, you can identify forward-looking statements by terminology such as &ldquo;may,&rdquo;
&ldquo;will,&rdquo; &ldquo;should,&rdquo; &ldquo;expects,&rdquo; &ldquo;intends,&rdquo; &ldquo;plans,&rdquo; &ldquo;anticipates,&rdquo;
&ldquo;believes,&rdquo; &ldquo;estimates,&rdquo; &ldquo;predicts,&rdquo; &ldquo;potential&rdquo; or &ldquo;continue&rdquo; or
the negative of these terms or other comparable terminology. These statements are subject to business and economic risk and reflect
management&rsquo;s current expectations, and involve subjects that are inherently uncertain and difficult to predict.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
light of these assumptions, risks and uncertainties, the results and events discussed in the forward-looking statements contained
in this prospectus or in any document incorporated by reference might not occur. Investors are cautioned not to place undue reliance
on the forward-looking statements, which speak only as of the date of this prospectus or the date of the document incorporated
by reference in this prospectus. We are not under any obligation, and we expressly disclaim any obligation, to update or alter
any forward-looking statements, whether as a result of new information, future events or otherwise.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

</DIV>


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<DIV STYLE="padding: 5pt; border: Black 1.5pt solid; width: 98%">

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_003"></A>PROSPECTUS
SUMMARY</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>This
summary highlights information contained elsewhere, or incorporated by reference, in this prospectus. As a result, it does not
contain all the information that may be important to you. To understand this transaction fully, you should read this entire prospectus
carefully, including the risk factors under the section entitled &ldquo;Risk Factors&rdquo; and the documents incorporated by
reference into this prospectus.</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Our
Business</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company is in the business of modifying cargo shipping containers and purpose-built modules for use in construction. We provide
two main products, both of which are used to meet the growing demand for safe and green commercial, industrial and residential
building construction. SG Blocks&trade; are code engineered cargo shipping containers that the Company modifies for use in construction.
Rather than consuming new steel and lumber, SG Blocks&trade; capitalize on the structural engineering and design parameters a
shipping container must meet and repurposes them for use in building. These products offer the construction industry a safer,
greener, faster, longer lasting and more economical alternative to conventional construction methods. The Company also provides
purpose-built modules, which are prefabricated steel modular units created specifically for use in modular construction, unlike
the shipping containers used to create SG Blocks&trade;. We sell our products primarily to customers in the multi-family housing,
restaurant, military, education industries throughout the United States.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
were incorporated in the State of Delaware in 1993. Our principal executive offices are located at 195 Montague Street, 14th Floor,
Brooklyn, NY 11201, and our telephone number is (646) 240-4235. Our website address is <U>www.sgblocks.com</U>. The information
contained on, or accessible through, our website is not part of this prospectus or any prospectus supplement.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>The
Offering</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="background-color: rgb(204,238,255); font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; width: 50%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Common
    Stock offered by the Stockholder&nbsp;</I></FONT></TD>
    <TD STYLE="width: 2%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 48%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Up to 622,726&nbsp;shares
    of our Common Stock.</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif; background-color: White">
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255); font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Common Stock
    outstanding</I></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As of August 8, 2018, there were 4,260,041 shares
    of our Common Stock issued and outstanding, not including 1,188,392 shares which may be acquired upon exercise of outstanding
    options. </FONT></TD></TR>
<TR STYLE="background-color: White; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255); font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Use of proceeds</I></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The Stockholder will receive all of the proceeds
    from the sale of Common Stock covered by this prospectus. Accordingly, we will not receive any proceeds from the sale of the
    shares of Common Stock covered by this prospectus. Please see &ldquo;Use of Proceeds&rdquo; below.&nbsp;&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: White; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255); font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Risk Factors</I></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Investing in our Common Stock involves substantial
    risk. For a discussion of risks relating to us, our business and an investment in our Common Stock that you should consider
    before investing in our Common Stock, see &ldquo;Risk Factors&rdquo; below and all other information set forth in this prospectus.
    </FONT></TD></TR>
<TR STYLE="background-color: White; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255); font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Nasdaq symbol</I></FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">SGBX</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

</DIV>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_004"></A>RISK
FACTORS</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Investing
in our securities involves a high degree of risk. Before purchasing our securities, you should carefully consider the risks, uncertainties
and forward-looking statements described under &ldquo;Risk Factors&rdquo; in Item 1A of our most recent Annual Report on Form
10-K for the fiscal year ended December 31, 2017, filed with the SEC on March 1, 2018, and each subsequently filed Quarterly Report
on Form 10-Q, as well as all of the information in this prospectus and information incorporated by reference into this prospectus,
any applicable prospectus supplement or any free writing prospectus. If any of these risks were to occur, our business, financial
condition or results of operations would likely suffer. In that event, the value of our securities could decline, and you could
lose part or all of your investment. The risks and uncertainties we describe are not the only ones facing us. Additional risks
not presently known to us or that we currently deem immaterial may also impair our business operations. In addition, our past
financial performance may not be a reliable indicator of future performance, and historical trends should not be used to anticipate
results in the future.&nbsp;&nbsp;See &ldquo;Special Note Regarding Forward-Looking Information&rdquo; above.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_005"></A>USE
OF PROCEEDS</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">This
prospectus relates to shares of our Common Stock that may be offered and sold from time to time by the Stockholder. We will not
receive any proceeds from the sale of the shares of our Common Stock by the Stockholder. In addition, we have agreed to pay certain
registration expenses of the Stockholder incurred in connection with the sale of Common Stock.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_006"></A>DESCRIPTION
OF TRANSACTIONS WITH THE STOCKHOLDER</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company and the Stockholder engaged in several transactions pursuant to which the Stockholder acquired the Company&rsquo;s Common
Stock. The share amounts below and dollar value per share related to the conversion of shares are presented on an as-adjusted
basis, taking into account a 1-for-3 reverse stock split effected by the Company on February 28, 2017.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Private
Placements</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Emergence
from Bankruptcy</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
October 15, 2015, the Company, as borrower, and its subsidiaries, as guarantors, entered into a Debtor in Possession Credit Agreement
(the &ldquo;DIP Facility&rdquo;) with the Stockholder, pursuant to which the Stockholder loaned the Company a maximum principal
amount of $600,000.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
October 15, 2015, the Company and its subsidiaries voluntarily filed for reorganization under Chapter 11 of the Bankruptcy Code,
in the United States Bankruptcy Court for the Southern District of New York (the &ldquo;Bankruptcy Court&rdquo;). On June 3, 2016,
the Company filed a plan of reorganization (the &ldquo;Plan&rdquo;), which was approved by the Bankruptcy Court and became effective
on June 30, 2016. Pursuant to the Plan, (i) all of the Company&rsquo;s then-existing secured debt converted into a total of 1,801,670
shares of Series A Convertible Preferred Stock (the &ldquo;Preferred Stock&rdquo;), of which 1,117,480 shares were held by the
Stockholder, and (ii) the Company&rsquo;s former common stock converted into 163,901 shares of new Common Stock, of which 8,817
shares were held by the Stockholder.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
addition, on June 30, 2016 and pursuant to the terms of the Plan, the Company entered into a Securities Purchase Agreement with
the Stockholder (the &ldquo;June 2016 SPA&rdquo;), pursuant to which the Company sold, for a subscription price of $2,000,000,
a 12% Original Issue Discount Senior Secured Convertible Debenture to the Stockholder in the principal amount of $2,500,000, with
a maturity date of June 30, 2018 (the &ldquo;June 2016 OID&rdquo;). The June 2016 OID was convertible at the Stockholder&rsquo;s
option at any time in whole or in part into shares of Common Stock at a ratio of 1 share for every $3.75 of debt. The June 2016
OID was used, among other things, to pay all amounts owed to the Stockholder under the DIP Facility.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><I></I></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>November
2016 Debenture</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
November 17, 2016, the Company entered into a Securities Purchase Agreement with the Stockholder (the &ldquo;November 2016 SPA&rdquo;),
pursuant to which the Company sold, for a subscription price of $750,000, a 12% Original Issue Discount Senior Secured Convertible
Debenture to the Stockholder in the principal amount of $937,500, with a maturity date of June 30, 2018 (the &ldquo;November 2016
OID&rdquo; and, together with the June 2016 OID, the &ldquo;2016 OID Debentures&rdquo;). The November 2016 OID was convertible
at the Stockholder&rsquo;s option at any time in whole or in part into shares of Common Stock at a ratio of 1 share for every
$3.75 of debt.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>June
2017 Public Offering</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 21, 2017, the Company completed a public offering of 1,500,000 shares at $5.00 per share (the &ldquo;Public Offering&rdquo;)
for gross proceeds equal to $7,500,000. The Public Offering was made pursuant to the Registration Statement on Form S-1 (File.
No. 333-215922) initially filed by the Company with the SEC on February 6, 2017 and declared effective by the SEC on June 21,
2017. On July 10, 2017, the underwriters of the Public Offering fully exercised their option to purchase an additional 225,000
shares of Common Stock at the public offering price of $5.00 per share, generating an additional $1,125,000 in gross proceeds.
After giving effect to the full exercise of the over-allotment option, the total number of shares sold by the Company in the Public
Offering increased to 1,725,000 shares and gross proceeds increased to $8,625,000.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
June 27, 2017, in connection with and upon the closing of the Public Offering, the Stockholder purchased 110,000 shares of Common
Stock for an aggregate purchase price of $550,000.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Effective
June 21, 2017, in connection with the Public Offering, (i) the Company&rsquo;s outstanding Preferred Stock was converted into
Common Stock, and the Company issued a total of 1,801,670 shares of Common Stock to the Company&rsquo;s then-existing preferred
stockholders, of which the Stockholder received 1,117,480 shares; and (ii) a portion of the 2016 OID Debentures, in the aggregate
amount of $1,937,500, was converted into 516,667 shares of Common Stock, which were issued to the Stockholder. The remaining $1,500,000
of the 2016 Debentures was repaid using proceeds from the Public Offering.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
or about June 21, 2017, the Stockholder transferred 815,000 shares of Common Stock received in connection with the Public Offering
to non-affiliate limited partners of the Stockholder (the &ldquo;June 2017 Distribution&rdquo;).</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Transfer
of Shares to HSPL</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Pursuant
to a Participation Agreement, dated August 31, 2017, between the Stockholder, acting through its general partner, Hillair Capital
Advisors LLC, and HSPL Holdings, LLC (&ldquo;HSPL&rdquo;), the Stockholder agreed to transfer to HSPL, as soon as reasonably practicable
after certain lock-up restrictions on such shares expired on December 19, 2017, 315,238 shares of Common Stock, in exchange for
HSPL&rsquo;s withdrawal of participation in the master fund managed by the Stockholder.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Registration
Rights </B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Preferred
Stock</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Pursuant
to the Certificate of Designation of Preferences, Rights and Limitations of the Series A Convertible Preferred Stock of SG Blocks,
Inc. (the &ldquo;Series A Certificate of Designation&rdquo;), the Company agreed, among other things, to file a registration statement
to register the Common Stock issuable upon conversion of the Preferred Stock.&nbsp;&nbsp;The registration statement of which this
prospectus is a part is being filed to comply with the requirements of the Series A Certificate of Designation.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>2016
OID Debentures</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>&nbsp;</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 24pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Pursuant
to the June 2016 SPA and the November 2016 SPA, the Company agreed, among other things, to file a registration statement to register
the Common Stock issuable upon conversion of the 2016 OID Debentures.&nbsp;&nbsp;The registration statement of which this prospectus
is a part is being filed to comply with the requirements of the June 2016 SPA and the November 2016 SPA.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 24pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 24pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
foregoing descriptions of the Series A Certificate of Designation, the June 2016 SPA, the November 2016 SPA and the 2016 OID Debentures
are not complete and are qualified in their entireties by reference to the full text of the Series A Certificate of Designation,
a copy of which is filed as Exhibit 3.2 to the Company&rsquo;s Current Report on Form 8-K as filed with the SEC on July 7, 2016;
with respect to the the June 2016 OID and the June 2016 SPA, filed as Exhibit 4.3 and Exhibit 4.4, respectively, to the Company&rsquo;s
Current Report on Form 8-K/A as filed with the SEC on August 8, 2016; and, with respect to the November 2016 OID and the November
2016 Purchase Agreement, filed as Exhibit 4.1 and Exhibit 4.2, respectively, to the Company&rsquo;s Current Report on Form 8-K
as filed with the SEC on November 22, 2016.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_007"></A>THE
STOCKHOLDER</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">This
prospectus relates to the sale or other disposition of up to 622,726 shares of our Common Stock by the Stockholder named below,
which includes all the shares of Common Stock held by the Stockholder pursuant to the transactions described above in &ldquo;Description
of Transactions with the Stockholder&rdquo; after giving effect to the June 2017 Distribution and the HSPL Transfer.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
below table, based upon information currently known by us, sets forth as of August 8, 2018, (i) the number of shares held of record
or beneficially by the Stockholder as of such date (as determined below) and (ii) the number of shares that may be sold or otherwise
disposed of under this prospectus by the Stockholder. Percentage ownership is based on 4,260,041 shares of Common Stock outstanding
as of August 8, 2018, plus securities deemed to be outstanding with respect to the Stockholder pursuant to Rule 13d-3(d)(1) under
the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;). Beneficial ownership includes shares of Common
Stock plus any securities held by the holder exercisable for or convertible into shares of Common Stock within 60 days after August
8, 2018, in accordance with Rule 13d-3(d)(1) under the Exchange Act. The inclusion of any shares in this table does not constitute
an admission of beneficial ownership for the Stockholder named below.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
do not know when or in what amounts the Stockholder may sell or otherwise dispose of the shares of Common Stock covered hereby.
The Stockholder may not sell or otherwise dispose of any or all of the shares offered by this prospectus and may sell or otherwise
dispose of shares covered hereby in transactions exempt from the registration requirements of the Securities Act. Because the
Stockholder may sell or otherwise dispose of some, all or none of the shares covered hereby, and because there are currently no
agreements, arrangements or understandings with respect to the sale of any of the shares, we cannot estimate the number of the
shares that will be held by the Stockholder after completion of the offering. However, for purposes of the following table, we
have assumed that all of the shares covered hereby are sold by the Stockholder pursuant to this prospectus.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Information
about additional selling stockholders, if any, including their identities and the Common Stock to be registered on their behalf,
will be set forth in a prospectus supplement, in a post-effective amendment or in filings that we make with the SEC under the
Exchange Act, which are incorporated by reference in this prospectus. Information concerning the Stockholder may change from time
to time. Any changes to the information provided below will be set forth in a supplement to this prospectus, in a post-effective
amendment or in filings we make with the SEC under the Exchange Act, which are incorporated by reference into this prospectus
if and when necessary.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
addition to the relationship resulting from the ownership of our shares of Common Stock or other securities, and as described
above under &ldquo;Risk Factors&rdquo; and &ldquo;Description of Transactions with the Stockholder,&rdquo; the Stockholder has
had the following material relationships with us and our subsidiaries within the past three years: Sean M. McAvoy, Co-Founder
and Managing Member of Hillair Capital Management LLC (&ldquo;HCM&rdquo;), served on our Board of Directors until August 2, 2018
and Neal Kaufman, Co-Founder and Managing Member of HCM, previously served on our Board of Directors until June 1, 2018.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1.5pt solid"><FONT STYLE="font-size: 10pt"><B>Name of Stockholder</B></FONT></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;<B>Common Stock Beneficially</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Owned Prior to the Offering</B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Common Stock Covered </B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>by this </B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Prospectus<SUP>(1)</SUP></B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><FONT STYLE="font-size: 10pt">&nbsp;<B>Common Stock Owned Upon Completion of this Offering</B></FONT></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1.5pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Percentage of Common</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Stock Owned Upon Completion of this</B></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Offering<SUP>(2)</SUP></B></P></TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 52%; text-align: left"><FONT STYLE="font-size: 10pt">Hillair Capital Investments L.P.<SUP>(3)</SUP></FONT></TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 9%; text-align: right">644,857</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 9%; text-align: right">622,726</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 9%; text-align: right">22,131</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 9%; text-align: right"><FONT STYLE="font-size: 10pt">*</FONT></TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
</TABLE>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*
Less than 1%</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; width: 7%; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</FONT></TD>
    <TD STYLE="width: 93%; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Includes
    all the shares of Common Stock held by the Stockholder pursuant to the transactions described above in &ldquo;Description
    of Transactions with the Stockholder,&rdquo; after giving effect to the June 2017 Distribution and the HSPL Transfer.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; width: 7%; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</FONT></TD>
    <TD STYLE="width: 93%; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Percentage
    ownership is calculated based upon 4,260,041 shares of Common Stock&nbsp;outstanding as of August 8, 2018.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; width: 7%; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(3)</FONT></TD>
    <TD STYLE="width: 93%; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Includes
    (i) 622,726 shares of Common Stock directly owned by the Stockholder and (ii) options to purchase 22,131 shares of Common
    Stock directly held by the Stockholder, which are fully vested and exercisable as of the date of this prospectus. the Stockholder,
    HCM and Sean M. McAvoy share voting and dispositive power of the shares of Common Stock. HCM, as investment adviser to the
    Stockholder, may be deemed to have dispositive power over the shares held by the Stockholder, and Mr. McAvoy, as the manager
    of HCM, may be deemed to have dispositive power over such shares as well. Each of HCM and Mr. McAvoy disclaim beneficial ownership
    over such shares except to the extent of its or his pecuniary interest therein. The principal business address of the foregoing
    is c/o Hillair Capital Management LLC, 345 Lorton Ave., Suite 303, Burlingame, CA &nbsp;94010.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>&nbsp;</B></FONT></P>


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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt"><A HREF="#toc">Table of Contents</A></P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_008"></A>PLAN
OF DISTRIBUTION</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Stockholder, which as used herein include donees, pledgees, transferees or other successors-in-interest selling shares of Common
Stock or interests in shares of Common Stock received after the date of this prospectus from the Stockholder as a gift, pledge,
partnership distribution or other transfer, may, from time to time, sell, transfer or otherwise dispose of any or all of its shares
of Common Stock or interests in shares of Common Stock on any stock exchange, market or trading facility on which the shares are
traded or in private transactions. These dispositions may be at fixed prices, at prevailing market prices at the time of sale,
at prices related to the prevailing market price, at varying prices determined at the time of sale or at negotiated prices.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Stockholder may use any one or more of the following methods when disposing of shares or interests therein:&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ordinary
    brokerage transactions and transactions in which the broker-dealer solicits purchasers;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">block trades in
    which the broker-dealer will attempt to sell the shares as agent, but may position and resell a portion of the block as principal
    to facilitate the transaction;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">purchases by a broker-dealer
    as principal and resale by the broker-dealer for its account;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">an exchange distribution
    in accordance with the rules of the applicable exchange;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">privately negotiated
    transactions;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">short sales effected
    after the date the registration statement of which this prospectus is a part is declared effective by the SEC;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">through the writing
    or settlement of options or other hedging transactions, whether through an options exchange or otherwise;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">broker-dealers may
    agree with the Stockholder to sell a specified number of such shares at a stipulated price per share;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">a combination of
    any such methods of sale; and</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">any other method
    permitted by applicable law.&nbsp;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Stockholder may, from time to time, pledge or grant a security interest in some or all of the shares of Common Stock owned by
it and, if it defaults in the performance of its secured obligations, the pledgees or secured parties may offer and sell the shares
of Common Stock, from time to time, under this prospectus, or under an amendment to this prospectus under Rule 424(b)(3) or other
applicable provision of the Securities Act amending the list of stockholders to include the pledgee, transferee or other successors-in-interest
as a stockholder under this prospectus. The Stockholder also may transfer the shares of Common Stock in other circumstances, in
which case the transferees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this
prospectus.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
connection with the sale of our Common Stock or interests therein, the Stockholder may enter into hedging transactions with broker-dealers
or other financial institutions, which may in turn engage in short sales of the Common Stock in the course of hedging the positions
they assume. The Stockholder may also sell shares of our Common Stock short and deliver these securities to close out its short
positions, or loan or pledge the Common Stock to broker-dealers that in turn may sell these securities. The Stockholder may also
enter into option or other transactions with broker-dealers or other financial institutions or the creation of one or more derivative
securities which require the delivery of shares offered by this prospectus to such broker-dealer or other financial institution,
which shares such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended
to reflect such transaction).</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
aggregate proceeds to the Stockholder from the sale of the Common Stock offered by it will be the purchase price of the Common
Stock less discounts or commissions, if any. The Stockholder reserves the right to accept and, together with its agents from time
to time, to reject, in whole or in part, any proposed purchase of Common Stock to be made directly or through agents. We will
not receive any of the proceeds from the sale of shares under this prospectus.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Stockholder also may resell all or a portion of the shares in open market transactions in reliance upon Rule 144 under the Securities
Act, provided that it meets the criteria and conforms to the requirements of that rule.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Stockholder and any underwriters, broker-dealers or agents that participate in the sale of the Common Stock or interests therein
may be &ldquo;underwriters&rdquo; within the meaning of Section 2(a)(11) of the Securities Act. Any discounts, commissions, concessions
or profit they earn on any resale of the shares may be underwriting discounts and commissions under the Securities Act. If the
Stockholder is an &ldquo;underwriter&rdquo; within the meaning of Section 2(a)(11) of the Securities Act, it will be subject to
the prospectus delivery requirements of the Securities Act.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To
the extent required, the shares of our Common Stock to be sold, the name of the Stockholder, the respective purchase prices and
public offering prices, the names of any agents, dealer or underwriter, and any applicable commissions or discounts with respect
to a particular offer will be set forth in an accompanying prospectus supplement or, if appropriate, a post-effective amendment
to the registration statement that includes this prospectus.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
order to comply with the securities laws of some states, if applicable, the Common Stock may be sold in these jurisdictions only
through registered or licensed brokers or dealers. In addition, in some states, the Common Stock may not be sold unless it has
been registered or qualified for sale or an exemption from registration or qualification requirements is available and is complied
with.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have advised the Stockholder that the anti-manipulation rules of Regulation M under the Exchange Act may apply to sales of shares
in the market and to the activities of the Stockholder and its affiliates. In addition, to the extent applicable, we will make
copies of this prospectus (as it may be supplemented or amended from time to time) available to the Stockholder for the purpose
of satisfying the prospectus delivery requirements of the Securities Act. The Stockholder may indemnify any broker-dealer that
participates in transactions involving the sale of the shares against certain liabilities, including liabilities arising under
the Securities Act.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_009"></A>LEGAL
MATTERS</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Thompson
Hine LLP, New York, New York, will provide us with an opinion as to certain legal matters in connection with the Common Stock
offered hereby.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_010"></A>EXPERTS</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
consolidated financial statements incorporated in this prospectus by reference to the Annual Report on Form 10-K for the year
ended December 31, 2017 have been so incorporated in reliance upon the report of Whitley Penn LLP, an independent registered public
accounting firm, given on the authority of such firm as experts in accounting and auditing.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_011"></A>WHERE
YOU CAN FIND ADDITIONAL INFORMATION</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
are a public company and file annual, quarterly and current reports, proxy statements and other information with the SEC. You
may read and copy any document we file with the SEC at the SEC&rsquo;s Public Reference Room, 100 F Street, N.E., Washington,
D.C. 20549. Please call the SEC at 1-800-SEC-0330 for more information about the operation of the Public Reference Room. Our SEC
filings are also available to the public at the SEC&rsquo;s website at www.sec.gov, and on our website at www.sgblocks.com. The
information contained on, or accessible through, our website is not part of this prospectus or any prospectus supplement. In addition,
our Common Stock is listed for trading on the Nasdaq Capital Market under the symbol &ldquo;SGBX.&rdquo;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">This
prospectus is only part of a registration statement on Form S-3 that we have filed with the SEC under the Securities Act, and
therefore omits certain information contained in the registration statement. We have also filed exhibits and schedules with the
registration statement that are excluded from this prospectus, and you should refer to the applicable exhibit or schedule for
a complete description of any statement referring to any contract or other document. You may:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

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    <TD STYLE="width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">inspect
    a copy of the registration statement, including the exhibits and schedules, without charge at the public reference room,</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">obtain
    a copy from the SEC upon payment of the fees prescribed by the SEC, or</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 0.5in; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">obtain
    a copy from the SEC&rsquo;s website or our website.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A NAME="a_012"></A>INFORMATION
INCORPORATED BY REFERENCE</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
SEC allows us to &ldquo;incorporate by reference&rdquo; the information we file with it, which means that we can disclose important
information to you by referring you to other documents that we have filed separately with the SEC. The information incorporated
by reference is considered to be part of this prospectus, except for any information superseded by information contained directly
in this prospectus, and information we file later with the SEC will automatically be deemed to update and supersede this information.
We incorporate by reference the documents listed below and any future filings made with the SEC under Sections 13(a), 13(c), 14
or 15(d) of the Exchange Act (excluding, in each case, any portions of such documents that have been &ldquo;furnished&rdquo; but
not &ldquo;filed&rdquo; for purposes of the Exchange Act). The documents we are incorporating by reference as of their respective
dates of filing are as follows:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

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<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 0.5in; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 0.5in; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
Annual Report on Form 10-K for the year ended December 31, 2017, filed with the SEC on March 1, 2018.</FONT></P></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif; text-align: justify; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
Current Reports on Form 8-K filed with the SEC on January 26, 2018, February 6, 2018, March 1, 2018, April 17, 2018, May 9, 2018,
June 5, 2018, July 30, 2018, and August 7, 2018.</FONT></P></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
Quarterly Report on Form 10-Q for the quarter ended March 31, 2018, filed with the SEC on May 9, 2018.</FONT></P></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The description
    of our Common Stock contained in our Registration Statement on Form 8-A filed under the Exchange Act, as filed on March 20,
    2017 (File No. 001-38037), including any amendment or report filed for the purpose of updating such description.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">In
addition, we also incorporate by reference all documents we file under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act (i)
after the initial filing date of the registration statement of which this prospectus is a part and before the effectiveness of
the registration statement and (ii) after the effectiveness of the registration statement and before the termination of the offering,
with the exception of any information furnished under Item 2.02 and Item 7.01 of any Current Report on Form 8-K, which is not
deemed filed and which is not incorporated by reference herein. The information contained in these future filings will automatically
update and supersede the information contained in this prospectus or incorporated by reference to any previously filed document.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Any
statement contained in a document incorporated by reference herein shall be deemed to be modified or superseded for all purposes
to the extent that a statement contained in this prospectus, or in any other subsequently filed document which is also incorporated
or deemed to be incorporated by reference, modifies or supersedes such statement. Any statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this prospectus.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">You
may request, orally or in writing, a copy of these filings, which will be provided to you at no cost, by contacting our investor
relations department at our principal executive offices, which are located at 195 Montague Street, 14th Floor, Brooklyn, NY 11201,
Attention: Investor Relations, Telephone: (646) 240-4235.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SG
Blocks, Inc.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>UP
TO 622,726 SHARES OF COMMON STOCK</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>PROSPECTUS</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>,
2018</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="margin-top: 0; text-align: center; margin-bottom: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>PART
II</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>INFORMATION
NOT REQUIRED IN PROSPECTUS</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item
14. Other Expenses of Issuance and Distribution.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>&nbsp;</I></B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
following table itemizes the fees and expenses incurred, or expected to be incurred, by the registrant in connection with the
registration of the securities being registered, other than underwriting discounts and commissions. All amounts are estimates,
except the SEC registration fee. Estimated expenses only include information that is known at the time of filing this registration
statement and are subject to future contingencies, including additional expenses for future offerings.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 88%; text-align: left">SEC registration fee</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 9%; text-align: right">388.42</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Legal fees and expenses</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">15,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Accounting fees and expenses</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">5,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Printing fees and expenses</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">500</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1.5pt">Miscellaneous fees and expenses</TD><TD STYLE="padding-bottom: 1.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1.5pt solid; text-align: right">1,000</TD><TD STYLE="padding-bottom: 1.5pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-bottom: 4pt">Total</TD><TD STYLE="padding-bottom: 4pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 4pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 4pt double; text-align: right">21,888.42</TD><TD STYLE="padding-bottom: 4pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item
15. Indemnification of Directors and Officers.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
are subject to the laws of Delaware on corporate matters, including its indemnification provisions. Section 145 of the General
Corporation Law of Delaware (the &ldquo;DGCL&rdquo;) provides that Delaware corporations are empowered, subject to certain procedures
and limitations, to indemnify any person against expenses (including attorneys&rsquo; fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by him in connection with any threatened, pending or completed action, suit or
proceeding (including a derivative action) in which such person is made a party by reason of his being or having been a director,
officer, employee or agent of the Company (each, an &ldquo;Indemnitee&rdquo;); provided that the right of an Indemnitee to receive
indemnification is subject to the following limitations: (i) an Indemnitee is not entitled to indemnification unless he acted
in good faith and in a manner that he reasonably believed to be in or not opposed to the best interests of the Company, and, with
respect to any criminal action or proceeding, had no reasonable cause to believe such conduct was unlawful; and (ii) in the case
of a derivative action, an Indemnitee is not entitled to indemnification in the event that he is judged to be liable to the Company
(unless and only to the extent that the court determines that the Indemnitee is fairly and reasonably entitled to indemnification
for such expenses as the court deems proper). The statute provides that indemnification pursuant to our provisions is not exclusive
of other rights of indemnification to which a person may be entitled under any by-law, agreement, vote of stockholders or disinterested
directors or otherwise.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><U>Certificate
of Incorporation</U></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company&rsquo;s Amended and Restated Certificate of Incorporation provides that, to the fullest extent permitted by the DGCL,
no director of the Company will have personal liability to the Company or its stockholders for monetary damages for breach of
fiduciary duty as a director, provided that nothing in the Amended and Restated Certificate of Incorporation will eliminate or
limit the liability of a director (i) for any breach of the director&rsquo;s duty of loyalty to the Company or its stockholders,
(ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under
Section 174 of the DGCL or (iv) for any transaction from which the director derived an improper personal benefit. In the event
the DGCL is amended so as to authorize corporate action further eliminating or limiting the liability of directors of the Company,
the liability of the directors will thereupon be eliminated or limited to the maximum extent permitted by the DGCL, as so amended
from time to time.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"></P>




<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company will indemnify any person: (a) who was or is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in
the right of the Company), by reason of the fact that such person is or was a director, officer, employee or agent of the Company
or is or was serving at the request of the Company as a director, officer, employee or agent of another company, partnership,
joint venture, trust or other enterprise against expenses (including attorneys&rsquo; fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, if such person
acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the best interests of the Company
and, with respect to any criminal action or proceeding, had no reasonable cause to believe his or her conduct was unlawful. The
termination of any action, suit or proceeding by judgment, order, settlement, conviction or upon a plea of nolo contendere or
its equivalent, will not, of itself, create a presumption that the person did not act in good faith and in a manner which such
person reasonably believed to be in or not opposed to the best interests of the Company or, with respect to any criminal action
or proceeding, that the person had reasonable cause to believe such person&rsquo;s action was unlawful; or (b) who was or is a
party or is threatened to be made a party to any threatened, pending or completed action or suit by or in the right of the Company
to procure a judgment in its favor by reason of the fact that such person is or was a director, officer, employee or agent of
the Company or is or was serving at the request of the Company as a director, officer, employee or agent of another company, partnership,
joint venture, trust or other enterprise against expenses (including attorneys&rsquo; fees) actually and reasonably incurred by
such person in connection with the defense or settlement of such action or suit, if such person acted in good faith and in a manner
he or she reasonably believed to be in or not opposed to the best interests of the Company, except that no indemnification will
be made in respect of any claim, issue or matter as to which such person will have been adjudged to be liable to the Company,
unless and only to the extent that the Court of Chancery or the court in which such action or suit was brought will determine
upon application that, despite the adjudication of liability, but in view of all the circumstances of the case, such person is
fairly and reasonably entitled to indemnity for such expenses which the Court of Chancery or such other court will deem proper.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To
the extent that a director, officer, employee or agent of the Company has been successful on the merits or otherwise in defense
of any action, suit or proceeding referred to in clauses (a) and (b) in the preceding paragraph or in defense of any claim, issue,
or matter therein, such person will be indemnified against expenses (including attorneys&rsquo; fees) actually and reasonably
incurred by such person in connection therewith. The rights conferred on any director of the Company under the Amended and Restated
Certificate of Incorporation will inure to the benefit of any entity that is affiliated with such director and that is a stockholder
of the Company. Any indemnification under clauses (a) and (b) in the preceding paragraph (unless ordered by a court) will be made
by the Company only as authorized in the specified case upon a determination that indemnification of the director, officer, employee
or agent is proper in the circumstances because such person has met the applicable standard of conduct set forth in clauses (a)
and (b) in the preceding paragraph. Such determination will be made: (1) by the Board of Directors of a majority vote of the quorum
consisting of directors who were not parties to such action, suit or proceeding; (2) if such quorum is not obtainable, or, even
if obtainable, a quorum of disinterested directors so directs, by independent legal counsel in a written opinion; or (3) by the
stockholders.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Expenses
incurred by an officer or director in defending a civil or criminal action, suit or proceeding may be paid by the Company in advance
of the final disposition of such action, suit or proceeding upon receipt of an undertaking by or on behalf of such director or
officer to repay such amount if it will ultimately be determined that such person is not entitled to be indemnified by the Company
as authorized in the Amended and Restated Certificate of Incorporation. Such expenses incurred by other employees and agents may
be so paid upon such terms and conditions, if any, as the Board of Directors deems appropriate.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
indemnification and advancement of expenses provided by or granted pursuant to the Amended and Restated Certificate of Incorporation
will not be deemed exclusive of any other rights to which one seeking indemnification or advancement of expenses may be entitled
under any by-law, agreement, vote of stockholders or disinterested directors or otherwise, both as to action in his or her official
capacity and as to action in another capacity while holding such office.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt"><A HREF="#toc">Table of Contents</A></P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
Company may purchase and maintain insurance on behalf of any person who is or was a director, officer, employee or agent of the
Company or is or was serving at the request of the Company as a director, officer, employee or agent of another company, partnership,
joint venture, trust or other enterprise against any liability asserted against him or her and incurred by him or her in such
capacity or arising out of his or her status as such, whether or not the Company would have the power to indemnify such person
against such liability under the provisions of the Amended and Restated Certificate of Incorporation.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">For
purposes of the Amended and Restated Certificate of Incorporation, references to &ldquo;the Company&rdquo; include, in addition
to the resulting Company, any constituent Company (including any constituent of a constituent) absorbed in a consolidation or
merger which, if its separate existence had continued, would have the power and authority to indemnify its directors, officers,
employees or agents, so that any person who is or was a director, officer, employee or agent of such constituent Company or is
or was serving at the request of such constituent Company as a director, officer, employee or agent of another company, partnership,
joint venture, trust or other enterprise will stand in the same position under the Amended and Restated Certificate of Incorporation
with respect to the resulting or surviving Company as he or she would have with respect to such constituent Company if its separate
existence had continued.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
indemnification and advancement of expenses provided by or granted pursuant to the Amended and Restated Certificate of Incorporation
will continue as to a person who has ceased to be a director, officer, employee or agent and will inure to the benefit of the
heirs, executors and administrators of such a person.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
carry insurance policies insuring our directors and officers against certain liabilities that they may incur in their capacities
as directors and officers.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><U>Indemnification
Agreements</U></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have entered into indemnification agreements with each of our current executive officers and directors. These agreements require
us to indemnify these individuals to the fullest extent permitted under Delaware law against liabilities that may arise by reason
of their service to us and to advance expenses reasonably incurred as a result of any proceeding against them as to which they
could be indemnified. Additionally, we may enter into indemnification agreements with any future directors or executive officers.&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item&nbsp;16.
Exhibits</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)&nbsp;Exhibits.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 7%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit</B></FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 91%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding-top: 0; padding-right: 0; border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding-left: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Number</B></FONT></TD>
    <TD STYLE="padding: 0 0 1.5pt; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding-top: 0; padding-right: 0; border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding-left: 0; text-indent: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Description
    of Document</B></FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.1</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016014815/f8k101515ex3i_sgblocksinc.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amended and Restated Certificate of Incorporation of SG Blocks, Inc. (incorporated herein by reference to Exhibit 3.1 to the Current Report on Form 8-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on July 7, 2016).</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.2</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390017001852/f8k022817ex3i_sgblocksinc.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amendment to Amended and Restated Certificate of Incorporation of SG Blocks, Inc. (incorporated herein by reference to Exhibit 3.1 to the Current Report on Form 8-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on February 28, 2017).</FONT></A></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.2</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390017001664/f10k2016ex3iv_sgblocks.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amended and Restated By-laws of SG Blocks, Inc. (incorporated herein by reference to Exhibit 3.4 to the Annual Report on Form 10-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on February 21, 2017).</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.1</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016014815/f8k101515ex3ii_sgblocksinc.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Certificate of Designation of Preferences, Rights and Limitations of Series A Convertible Preferred Stock (incorporated herein by reference to Exhibit 3.2 to the Current Report on Form 8-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on July 7, 2016).</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.2</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390017005022/f8k051117ex3i_sgblocksinc.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Certificate of Amendment to Certificate of Designation, dated May 11, 2017 (incorporated herein by reference to Exhibit 3.1 to the Current Report on Form 8-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on May 12, 2017).</FONT></A></TD></TR>
</TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0"></P>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt"><A HREF="#toc">Table of Contents</A></P></DIV>
    <!-- Field: /Page -->

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 7%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">4.3</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 2%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 91%; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016015622/f8k101515a1ex4iii_sgblocks.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Original Issue Discount Senior Secured Convertible Debenture due June 30, 2018, dated as of June 30, 2016, by and between Hillair Capital Investments, L.P. and SG Blocks, Inc. (incorporated herein by reference to Exhibit 4.3 to the Current Report on Form 8-K/A as filed by SG Blocks, Inc. with the Securities and Exchange Commission on August 8, 2016).</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">4.4</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016018874/f8k111716ex4i_sgblocksinc.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Original Issue Discount Senior Secured Convertible Debenture due June 30, 2018, dated as of November 17, 2016, by and between Hillair Capital Investments, L.P. and SG Blocks, Inc. (incorporated herein by reference to Exhibit 4.1 to the Current Report on Form 8-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on November 22, 2016).</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">10.1</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016015622/f8k101515a1ex4iv_sgblocks.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Securities Purchase Agreement, dated as of June 30, 2016, by and between SG Blocks, Inc. and Hillair Capital Investments L.P. (incorporated herein by reference to Exhibit 4.4 to the Current Report on Form 8-K/A as filed by SG Blocks, Inc. with the Securities and Exchange Commission on August 8, 2016).</FONT></A></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">10.2</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016015622/f8k101515a1ex4v_sgblocks.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Subsidiary Guarantee, dated as of June 30, 2016, by SG Building Blocks, Inc. (incorporated herein by reference to Exhibit 4.5 to the Current Report on Form 8-K/A as filed by SG Blocks, Inc. with the Securities and Exchange Commission on August 8, 2016).</FONT></A></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">10.3</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016015622/f8k101515a1ex4vi_sgblocks.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Security Agreement, dated as of June 30, 2016, by and between SG Blocks Inc., SG Building Blocks, Inc. and Hillair Capital Investments L.P. (incorporated herein by reference to Exhibit 4.6 to the Current Report on Form 8-K/A as filed by SG Blocks, Inc. with the Securities and Exchange Commission on August 8, 2016).</FONT></A></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">10.4</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016018874/f8k111716ex4ii_sgblocksinc.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Securities Purchase Agreement, dated as of November 17, 2016, by and between SG Blocks, Inc. and each of the purchasers identified therein (incorporated herein by reference to Exhibit 4.2 to the Current Report on Form 8-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on November 22, 2016).</FONT></A></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">10.5</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="http://www.sec.gov/Archives/edgar/data/1023994/000121390016014815/f8k101515ex4i_sgblocksinc.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Debtor in Possession Credit Agreement, dated as of October 15, 2015, by and between SG Blocks, Inc., SG Building Blocks, Inc. and Endaxi Infrastructure Group, Inc., as borrowers, and Hillair Capital Investments L.P. (incorporated herein by reference to Exhibit 4.1 to the Current Report on Form 8-K as filed by SG Blocks, Inc. with the Securities and Exchange Commission on July 7, 2016).</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">5.1</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="fs32018ex5-1_sgblocks.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Opinion of Thompson Hine LLP regarding legality of the shares of common stock being registered+</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">23.1</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="fs32018ex23-1_sgblocksinc.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Consent of Whitley Penn LLP+</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">23.2</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="fs32018ex5-1_sgblocks.htm"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Consent of Thompson Hine LLP (included in Exhibit 5.1 to this Registration Statement on Form&nbsp;S-3)+</FONT></A></TD></TR>
<TR STYLE="background-color: white; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR STYLE="background-color: #CCEEFF; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">24.1</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; text-align: justify"><A HREF="#s_001"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Power of Attorney (included on signature page)+</FONT></A></TD></TR>
</TABLE>
<P STYLE="margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 3%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 1%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif; width: 96%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To
    be filed by amendment or as an exhibit to a report pursuant to Section&nbsp;13(a), 13(c) or 15(d) of the Exchange Act and
    incorporated herein by reference.</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">+</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Filed
    herewith.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>




<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt"><A HREF="#toc">Table of Contents</A></P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item
17. Undertakings.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)
The undersigned registrant hereby undertakes:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)
To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(i)&nbsp;
To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(ii)
To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set
forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if
the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high
end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule
424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate
offering price set forth in the &ldquo;Calculation of Registration Fee&rdquo; table in the effective registration statement; and</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(iii)
To include any material information with respect to the plan of distribution not previously disclosed in the registration statement
or any material change to such information in the registration statement;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>provided,
however</I>, that paragraphs (i), (ii) and (iii) do not apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in reports filed with or furnished to the SEC by the registrant pursuant to Section 13 or Section
15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement, or is contained
in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)
That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall
be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at
that time shall be deemed to be the initial<I>&nbsp;&nbsp;bona fide</I>&nbsp;&nbsp;offering thereof.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(3)
To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold
at the termination of the offering.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(4)
That, for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(i)
Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as
of the date the filed prospectus was deemed part of and included in the registration statement; and</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 48pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(ii)
Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance
on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information
required by Section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement
as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale
of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and
any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement
relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration
statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by
reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with
a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement
or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(b)
The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933,
each filing of the registrant&rsquo;s annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934
that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to
the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial <I>bona fide
</I>offering thereof.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(c)
Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and
controlling persons of the registrant pursuant to the indemnification provisions described herein, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel
the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication
of such issue.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; text-align: center"><A NAME="s_001"></A><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>SIGNATURES</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Pursuant
to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it
meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf
by the undersigned, thereunto duly authorized, in the City of New York, State of New York, on the 10th day of August, 2018.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="2" STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>SG BLOCKS, INC.</B></FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 60%; padding: 0 0 1.5pt; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 4%; padding: 0 0 1.5pt; font: 10pt Times New Roman, Times, Serif; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</FONT></TD>
    <TD STYLE="width: 36%; border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding-top: 0; padding-right: 0; padding-left: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    Paul M. Galvin</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Paul
                                         M. Galvin</FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief
        Executive Officer and Chairman of the Board</FONT></P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">KNOW
ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below does hereby constitute and appoint jointly and severally,
Paul M. Galvin and Mahesh S. Shetty, or either of them, with full power of substitution and full power to act without the other,
his or her true and lawful attorney-in-fact and agent to act for him or her in his or her name, place and stead, in any and all
capacities, to sign any or all amendments to this registration statement, and to file each of the same, with all exhibits thereto,
and other documents in connection therewith or herewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact
and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary
to be done in and about the premises in order to effectuate the same as fully, to all intents and purposes, as they, he or she
might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, may lawfully
do or cause to be done by virtue hereof.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Pursuant
to the requirements of the Securities Exchange Act of 1934, this registration statement has been signed below by the following
persons on behalf of the Company and in the capacities and on the date indicated.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 30%; border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: center; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Signature</B></FONT></TD>
    <TD STYLE="width: 1%; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 52%; border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: center; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Title</B></FONT></TD>
    <TD STYLE="width: 1%; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 16%; border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-align: center; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Date</B></FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="vertical-align: bottom; border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    Paul M. Galvin</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief
    Executive Officer and Chairman of the Board</FONT></TD>
    <TD STYLE="vertical-align: top; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">August
    10, 2018</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Paul
    M. Galvin</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Principal
    Executive Officer)</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    Mahesh S. Shetty</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">President,
    Chief Financial Officer and Director (Principal </FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">August
    10, 2018</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Mahesh
    S. Shetty</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Financial
    Officer and Principal Accounting Officer)</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    Balan R. Ayyar</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">August
    10, 2018</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Balan
    R. Ayyar</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    Yaniv Blumenfeld</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">August
    10, 2018</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Yaniv
    Blumenfeld</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="border-bottom: black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    Christopher Melton</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">August
    10, 2018</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Christopher
    Melton</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    A. Richard Moore, Jr.</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">August
    10, 2018</FONT></TD></TR>
<TR STYLE="vertical-align: top; font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">A.
    Richard Moore, Jr. </FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: center; padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
</TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0">II-7</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>



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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>fs32018ex5-1_sgblocks.htm
<DESCRIPTION>OPINION OF THOMPSON HINE LLP REGARDING LEGALITY OF THE SHARES OF COMMON STOCK BEING REGISTERED
<TEXT>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Exhibit
5.1</B>&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0"><IMG SRC="ex5-1_001.jpg" ALT="">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">August
10, 2018</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SG
Blocks, Inc.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">195
Montague Street, 14th Floor</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Brooklyn,
New York 11201</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>RE:
REGISTRATION STATEMENT ON FORM&nbsp;S-3</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Ladies
and Gentlemen:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">We
have acted as counsel to SG Blocks, Inc., a Delaware corporation (the &ldquo;Company&rdquo;), in connection with the preparation
and filing of a registration statement, as amended, on Form&nbsp;S-3 (the &ldquo;Registration Statement&rdquo;) relating to the
registration under the Securities Act of 1933, as amended (the &ldquo;Securities Act&rdquo;), of up to 622,726 shares of common
stock, par value $0.01 per share, of the Company, plus an indeterminate number of shares of common stock that may be issued upon
stock splits, stock dividends or similar transactions in accordance with Rule 416 of the Securities Act (collectively, the &ldquo;Shares&rdquo;),
which may be offered and sold by the stockholder named in the Registration Statement.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">In
connection with the foregoing, we have reviewed the Company&rsquo;s Amended and Restated Certificate of Incorporation, as amended,
Amended and Restated Bylaws, Certificate of Designation of Preferences, Rights and Limitations of Series A Convertible Preferred
Stock (the &ldquo;Certificate of Designations&rdquo;), and such other charter documents and have examined all instruments, documents
and records which we deemed relevant and necessary for the basis of our opinion hereinafter expressed. In such examination, we
have assumed the genuineness of all signatures and the authenticity of all documents submitted to us as originals and the conformity
to the originals of all documents submitted to us as copies.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Based
on such examination, we are of the opinion that (i) the Shares have been duly and validly authorized and reserved for issuance,
and (ii) the portion of the Shares that are currently outstanding are validly issued, fully paid and nonassessable.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">We
express no opinion as to any matter other than as expressly set forth above, and no opinion, other than the opinion given herein,
may be inferred or implied herefrom. We undertake no, and hereby disclaim, any obligation to advise the Company or anyone else
of any change in any matter set forth herein.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">We
hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the use of our name under the
caption &ldquo;Legal Matters&rdquo; in the Registration Statement and the Prospectus included therein, as originally filed or
as subsequently amended. In giving such consent, we do not thereby admit that we are within the category of persons whose consent
is required under Section 7 of the Securities Act and the rules and regulations thereunder.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="width: 60%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="width: 40%; font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Very
    truly yours,</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0">&nbsp;</TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0 0 1.5pt; text-indent: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="padding-top: 0; padding-right: 0; border-bottom: Black 1.5pt solid; font: 10pt Times New Roman, Times, Serif; padding-left: 0; text-indent: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">/s/
Thompson Hine LLP</FONT></TD></TR>
<TR STYLE="font: 10pt Times New Roman, Times, Serif">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding: 0; text-indent: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</FONT></TD>
    <TD STYLE="padding: 0; text-indent: 0; font: 10pt Times New Roman, Times, Serif"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Thompson
        Hine LLP</FONT></P></TD></TR>
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<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>fs32018ex23-1_sgblocksinc.htm
<DESCRIPTION>CONSENT OF WHITLEY PENN LLP
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<P STYLE="margin-top: 0; text-align: right; margin-bottom: 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit
23.1</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; text-align: center; margin-bottom: 0"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Consent
of Independent Registered Public Accounting Firm</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
consent to the incorporation by reference in this registration statement on Form S-3 of SG Blocks, Inc. of our report dated March
1, 2018, relating to our audit of the consolidated balance sheets of SG Blocks, Inc. and subsidiaries as of December 31, 2017
and 2016, and the related consolidated statements of operations, changes in stockholders&rsquo; equity, and cash flows for the
year ended December 31, 2017 and the six month periods ended June 30, 2016 (Predecessor) and December 31, 2016 (Successor), which
report appears in the Company&rsquo;s Annual Report on Form 10-K for the year ended December 31, 2017.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
Whitley Penn LLP</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dallas,
Texas</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">August
10, 2018</FONT></P>

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<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>ex5-1_001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
begin 644 ex5-1_001.jpg
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</DOCUMENT>
<DOCUMENT>
<TYPE>COVER
<SEQUENCE>6
<FILENAME>filename6.htm
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<P STYLE="margin-top: 0; text-align: center; margin-bottom: 0"><IMG SRC="ex5-1_001.jpg" ALT="">&nbsp;</P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0">August 10, 2018</P>

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0">Via EDGAR</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">United States Securities and Exchange Commission</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Division of Corporation Finance</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">100 F. Street, N.E.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Washington, D.C. 20549</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 5%">RE: </TD>
    <TD STYLE="width: 91%">SG Blocks, Inc. Securities
Act Registration Statement on Form S-3</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Ladies and Gentlemen,</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 13pt; text-indent: 0.5in">Attached please find the Securities Act
Registration Statement on Form S-3 filed by SG Blocks, Inc. (the &ldquo;Company&rdquo;) in connection with the registration of
shares of Common Stock. The Company hopes that the Form S-3 will be declared effective by mid- to late-August 2018.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in"><FONT STYLE="font-size: 10pt">If you
have any questions or comments regarding this filing, please call me at (216) 566-5598 or contact me via e-mail at </FONT>David.Watson@ThompsonHine.com<FONT STYLE="font-size: 10pt">.
We would appreciate if you could please advise us once your review is completed in order to accommodate the Company&rsquo;s timeline.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in"><FONT STYLE="font-size: 10pt"></FONT></P>

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    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 62%">&nbsp;</TD>
    <TD STYLE="width: 33%">Respectfully,</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1.5pt solid">/s/ David Watson</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>David Watson</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
    <TD>cc:&#9;</TD>
    <TD>Mahesh S. Shetty, SG Blocks, Inc.<BR>
(E-mail: mshetty@sgblocks.com); telephone: (646) 240-4235)</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>

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