Assumption of Loan Requirement Letter for disaster loan servicing action request packages. About this document and download.What Is Required to Assume an SBA 504 Loan? Mortgage Calculator. How much will your monthly mortgage payment be? When refinancing with an SBA 504 loan, business owners can obtain up to 20 percent of the appraised value of the property in cash out. Enter the amount of the Second Deed of Trust, if any. Check all the applicable boxes, and complete the information requested. â–« First Residential Mortgage Loan Application - Form 1003 (signed and dated). Unincorporated Alameda County includes six Census Designated Places: Ashland, Castro Valley,.