13 CFR 120.923 - Policies on subordination.
(a) Financing provided by the seller of Project Property must be subordinate to the 504 loan. SBA may waive the subordination requirement if the property is classified as “other real estate owned” by a national bank or other Federally regulated lender and SBA considers the property to be of sufficient value to support the 504 loan.
(b) A Borrower is eligible for a 504 loan even if part of the Project financing is tax-exempt. SBA's lien position must not be subordinate to loans made from the proceeds of the tax-exempt obligation.