Why invest in multi-family homes? Rental property investing is the preferred investment strategy for those investors who want an additional stream of monthly income along with slow but steady appreciation in the value of their portfolio. Multi-family consists of two or more units in a single location. Some multi-family investors prefer duplexes (2 units), tri-plexes (3 units), or quadplexes (4 units), while some want 5+ units which transition from residential real estate to commercial real estate. Multi-family homes can equal more income and a faster track to financial freedom for investors.