Multiplex and multi-family house plans fall into the duplex and triplex housing categories. These homes serve the purpose of providing adequate housing to millions of Americans. Multi-family home is ideal for real estate investors, land developers, or the average hardworking American that invests in real estate as well, offset mortgages, or own a rental home of their own.
Building a duplex or multiplex in most cases costs about the same as building a regular single family residential home. If used as a rental home, they can generate 2 times the income of a single-family rental home. Investors especially like them for this reason.