The National Association of Home Builders (NAHB) says that construction of multifamily housing will continue to be strong this year and in the future.? In 2013, 340,000 multifamily dwellings were built, up significantly from just 82,000 in 2009.? Why the need for multifamily housing?? Because of slow employment, lower salaries, and low credit scores, many adults are finding it difficult to buy a home, and therefore, must rent instead.