FLEX SPACE OFFICE LEASE THIS FLEX SPACE OFFICE LEASE (the "Lease"), made this I c, -- n--\ day of OISC-6/v' e,Gi<- , 2019 (the "Lease Date"), by and between Saul Holdings Limited Partnership, a Maryland limited partnership (hereinafter "Landlord"); and GeneDX, Inc., a New Jersey corporation (hereinafter 1'Tenant"). WITNESSETH: WHEREAS, Landlord and Tenant (or its predecessor) have entered into that certain lease agreement dated June 11, 2002 (as amended, the "Existing Lease"); and WHEREAS, Landlord and Tenant desire to enter into the Lease to take effect upon the expiration of the Existing Lease. NOW, THEREFORE, in consideration of the mutual covenants and agreements herein contained, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree as follows: I. PREMISES. For and in consideration of the rent hereinafter reserved and the mutual covenants hereinafter contained, Landlord does hereby lease and demise unto Tenant, and Tenant does hereby hire, lease and accept, from Landlord, approximately eighty-three thousand six hundred seventy--three (83,673) gross rentable square feet of space (the "Gross Area") comprised of (i) approximately forty--seven thousand six hundred eighty-eight (47,688) rentable square feet known as Suite I in the building located at 205 Perry Parkway, Gaithersburg, Maryland 20877, and (ii) approximately thirty five thousand nine hundred eighty--five (35,985) rentable square feet known as Suite 2 in the building located at 207 Perry Parkway, Gaithersburg, Maryland 20877 (collectively, the "Building"), situated on Phase 1 of the Avenel Business Park (the "Property") all upon the terms and conditions hereafter set forth. That portion of the Gross Area which Tenant shall be entitled to occupy is hereinafter referred to as the "Premises," and is outlined and shaded in red on the site plan, together with the Building and the Property, attached hereto as Exhibit A and by this reference made a part hereof. lt is specifically understood that for purposes of calculating any payments or pro-rations hereunder, the number of gross rentable square feet set forth above shall control. Tenant acknowledges that it currently possesses the Premises. Except as otherwise provided in Article 59 of this Lease, the Premises have been accepted by Tenant in its "as--is" condition and are measured in accordance with the BOMA Standard Method of Measuring Floor Area in Office Buildings (ANSI/BOMA Z.65.1 1996), such measurement being subject to confirmation by Tenant's architect, provided, however, that confirmation by Tenant's architect shall be completed prior to the Lease Date. 2. TERM. The term of this Lease (the "Term") shall commence on the April I, 2020 and shall end at midnight on August 31, 2031. The "Rent Commencement Date" shall be September I, 202 l. 3. RENT. (a) Commencing with the Rent Commencement Date, Tenant shall pay as annual rent for the Premises the sum of One Million Fam Thousand Seventy-Six and No/I 00 Dollars ($ I ,004,076.00) per annum, payable in equal monthly installments of Eighty--Three Thousand Six Hundred Seventy--Three and No/100 Dollars ($83,673.00) each (the "Base Rent"). All such monthly installments of rent shall be payable to Landlord at the address specified in Article 33 of this Lease, in advance, without previous notice or demand therefor, and without deduction, setoff or recoupment, with the first monthly installment to be due and payable no later than the Rent Commencement Date and each subsequent monthly installment to be due and payable on the first day of each and every month following the Rent Commencement Date during the Term hereof. If the Rent Commencement Date is a date other than the first day of a month, rent for the period Page I of 100 GeneDX, Inc. - 2019 Lease - L7 - Last Saved by AES - 9/12/2019 3:41 :00 PM Exhibit 10.15