Affordable Housing Property management has never been faster, easier, or more cost-effective than with MultiSite Systems. Easily manage properties with multiple subsidy contracts. The most complete comprehensive Tax Credit solution. Concurrent Multiple Subsidy Qualifying. Easily manage properties that have HUD, HOME, RD and multiple layers Tax Credit on one property. A comprehensive, flexible software that property management companies have been using since 1997 over the Internet to manage a variety of properties and corporate office operations.