According to InvestorDictionary.com, a gap mortgage is an interim loan used between the end of loans, or floor loans, while developing property, and the start of a permanent mortgage taken out by the person purchasing the property.
A gap mortgages allows funding for a property to continue while it is going through the process of selling. According to AllBusiness.com, a developer of commercial or residential property may get a "floor loan" that covers a majority of the mortgage until a certain amount of the property is occupied. The gap loan acts as a bridge to the full amount of a mortgage until a property reaches the target amount of occupancy.
Gap mortgages are largely a financial tool used by businesses involved in large commercial and residential developments. Once a building reaches target occupancy, the gap loan is retired as the payments for property come in. Procuring a gap loan will depend on a number of factors, including credit requirements from a bank, size of gap loan and purpose of the gap loan.