	March 31,		December 31,
	2019		2018
Construction revolvers	$	1,883	$	2,220
Development and acquisition notes		7,293		10,290
Line of credit		-		13
Other		857		909
Total secured notes		10,033		13,432
Unsecured financing, net of unamortized deferred financing charges of $0 and $0, respectively		595		595
Notes payable- due to affiliates, unsecured, net of $0.8 million and $0.8 million discount and unamortized deferred financing charges, respectively		4,935		4,903
Total notes payable	$	15,563	$	18,930

As of March 31, 2019, net maturities and/or curtailment obligations of all borrowings are as follows:

2019	$	4,935
2020		4,802
2021		4,375
2022		1,419
2023 and thereafter		32
Total	$	15,563

As of March 31, 2019, the Company had no credit facilities or project related loans scheduled to mature during the remainder of 2019.

The Company enters into secured acquisition and development loan agreements to purchase and develop land parcels. In addition, the Company enters into secured construction loan agreements for the construction of its real estate inventories. The loans are repaid with proceeds from home closings based upon a specific release price, as defined in each respective loan agreement.

The Company had $1.9 million and $2.2 million of outstanding secured construction borrowings as of March 31, 2019 and December 31, 2018, respectively. Interest rates charged under these facilities include the London Interbank Offered Rate (“LIBOR”) and prime rate pricing options, subject to minimum interest rate floors. At March 31, 2019 and December 31, 2018, the weighted average interest rate on the Company’s outstanding construction revolving facilities was 5.7% per annum. The construction credit facilities have maturity dates ranging from March 15, 2020 to July 31, 2020, including extensions subject to the Company meeting certain conditions.

As of March 31, 2019, and December 31, 2018, the Company had approximately $7.3 million and $10.3 million, respectively, of aggregate acquisition and development loans outstanding. These loans have maturity dates ranging from March 15, 2020 to July 25, 2021, including extensions subject to certain conditions, and bear interest at a rate based on LIBOR and prime rate pricing options, with interest rate floors ranging from 4.25% to 5.50% per annum. As of March 31, 2019 and December 31, 2018, the weighted average interest rate was 5.9% and 6.6% per annum, respectively.

During 2018, the Company opened a secured line of credit with a maximum capacity of $0.2 million, which was paid in full during the three months ended March 31, 2019. Interest charged on this line of credit was based on the prime rate plus 2.50%. As of December 31, 2018, there was $13 thousand of principal and interest outstanding on this line of credit, and the interest rate was 6.75%.

As of March 31, 2019 and December 31, 2018, the Company had one secured loan related to Comstock Environmental. The loan was used to finance the acquisition of Comstock Environmental, and carries a fixed interest rate of 6.5%, with a maturity date of October 17, 2022. At March 31, 2019 and December 31, 2018, this financing had an outstanding balance of $824 thousand and $874 thousand, respectively. This financing is secured by the assets of Comstock Environmental and is guaranteed by our Chief Executive Officer.

As of March 31, 2019 and December 31, 2018, the Company had one unsecured seller-financed promissory note with an outstanding balance of $595 thousand. This financing carries an annual interest rate of LIBOR plus 3% and has a maturity date of July 17, 2022. At March 31, 2019 and December 31, 2018, the interest rate was 5.7% and 6.0%, respectively.

On October 17, 2014, Comstock Growth Fund, L.C. (“CGF”) entered into a subscription agreement with CDS, pursuant to which CDS purchased membership interests in CGF for a principal amount of $10.0 million (the “CGF Private Placement”). Other investors who subsequently purchased interests in the CGF Private Placement included members of the Company’s management and board of directors and other third party accredited investors for an additional principal amount of $6.2 million.

On October 17, 2014, the Company entered into an unsecured promissory note with CGF whereby CGF made a loan to the Company in the initial principal amount of $10.0 million and a maximum amount available for borrowing of up to $20.0 million with a three-year term. On December 18, 2014, the loan agreement was amended and restated to provide for a maximum capacity of $25 million. On May 23, 2018, Comstock Holding Companies, Inc. (“Comstock” , “CHCI” or the “Company”) entered into a Membership Interest Exchange and Subscription Agreement (the “Membership Exchange Agreement”), together with a revised promissory note agreement, in which a note (“CGF Note”) with an outstanding principal and accrued interest balance of $7.7 million was exchanged for 1,482,300 shares of the Company’s Series C Non-Convertible Preferred Stock, par value $0.01 per share and a stated liquidation value of $5.00 per share (the “Series C Preferred Stock”), issued by the Company to Comstock Development Services, LLC (“CDS”), a Company wholly owned by our Chief Executive Officer. The Company exchanged the preferred equity for 91.5% of CDS membership interest in the Comstock Growth Fund promissory note. Concurrently, the face amount of the CGF Note was reduced to $5.7 million as of the Effective Date. The loan bears interest at a fixed rate of 10% per annum. Interest payments will be made monthly in arrears. The Company is the administrative manager of CGF but does not own any membership interests. The Company had approximately $4.9 million of outstanding borrowings and accrued interest under the CGF loan, net of discounts, as of March 31, 2019 and December 31, 2018. As of March 31, 2019, and December 31, 2018, the interest rate was 10.0% per annum. The maturity date for the CGF loan was April 16, 2019. Subsequent to March 31, 2019, the Company secured an extension on the CGF loan, providing for a new maturity date of April 16, 2020. See Note 22 – Subsequent Events for further discussion on the extension.

For the three months ended March 31, 2019 and 2018, the Company made interest payments of $0.2 million and $0.1 million, respectively.

During the three months ended March 31, 2019 and 2018, the Company did not make principal payments to CGF.