What is Loan Against Property? A Loan against property or LAP is a loan given by the lender to the borrower against the property mortgaged. Unlike the unsecured loan, the loan against property involves a security that is the property, which the borrower can mortgage in case the loan is not repaid by the borrower. Hence, it is a type of mortgage loan. In such loans, the market value of the property is calculated and the loan furnished is a certain percentage of the market value of the loan.