<SEC-DOCUMENT>0001965301-25-000141.txt : 20250917
<SEC-HEADER>0001965301-25-000141.hdr.sgml : 20250917
<ACCEPTANCE-DATETIME>20250917160009
ACCESSION NUMBER:		0001965301-25-000141
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250917
DATE AS OF CHANGE:		20250917

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COPT DEFENSE PROPERTIES
		CENTRAL INDEX KEY:			0000860546
		STANDARD INDUSTRIAL CLASSIFICATION:	REAL ESTATE INVESTMENT TRUSTS [6798]
		ORGANIZATION NAME:           	05 Real Estate & Construction
		EIN:				232947217
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-14023
		FILM NUMBER:		251319963

	BUSINESS ADDRESS:	
		STREET 1:		6711 COLUMBIA GATEWAY DRIVE
		STREET 2:		SUITE 300
		CITY:			COLUMBIA
		STATE:			MD
		ZIP:			21046
		BUSINESS PHONE:		4432855400

	MAIL ADDRESS:	
		STREET 1:		6711 COLUMBIA GATEWAY DRIVE
		STREET 2:		SUITE 300
		CITY:			COLUMBIA
		STATE:			MD
		ZIP:			21046

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CORPORATE OFFICE PROPERTIES TRUST
		DATE OF NAME CHANGE:	19980514

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CORPORATE OFFICE PROPERTIES TRUST INC
		DATE OF NAME CHANGE:	19980105

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ROYALE INVESTMENTS INC
		DATE OF NAME CHANGE:	19930328

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Trimberger Lisa G
		CENTRAL INDEX KEY:			0001718603
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		COPT DEFENSE PROPERTIES
		STREET 2:		6711 COLUMBIA GATEWAY DRIVE, SUITE 300
		CITY:			COLUMBIA
		STATE:			MD
		ZIP:			21046
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001718603</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>


    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000860546</issuerCik>
      <issuerName>COPT DEFENSE PROPERTIES</issuerName>
      <secFileNumber>001-14023</secFileNumber>
      <issuerAddress>
        <com:street1>6711 COLUMBIA GATEWAY DRIVE</com:street1>
        <com:street2>SUITE 300</com:street2>
        <com:city>COLUMBIA</com:city>
        <com:stateOrCountry>MD</com:stateOrCountry>
        <com:zipCode>21046</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>4432855400</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Trimberger Lisa G</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>William Blair &amp; CO</name>
        <address>
          <com:street1>150 N Riverside Plaza Suite 3500</com:street1>
          <com:city>Chicago</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60666</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>3000</noOfUnitsSold>
      <aggregateMarketValue>91560.00</aggregateMarketValue>
      <noOfUnitsOutstanding>112927513</noOfUnitsOutstanding>
      <approxSaleDate>09/17/2025</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>11/30/2017</acquiredDate>
      <natureOfAcquisitionTransaction>Open Market</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Open Market</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3000</amountOfSecuritiesAcquired>
      <paymentDate>11/30/2017</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>09/17/2025</noticeDate>
      <signature>Carmen Zamores as a duly authorized representative of National Financial Services LLC, as attorney-in-fact for Trimberger Lisa G</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
