As the old adage goes, if you can't beat 'em, join 'em. Precisely what some of the nation's home builders are doing. Faced with heavy competition from a hot rental market, they are turning some of their resources to building multi-family, rental apartment buildings.

"There is always a need for construction of multi-family, and it has always been an important part of the housing picture," says Stuart Miller, CEO of Miami-based Lennar, one of the nation's largest public home builders.