A fourplex is the best investment you could ever make most likely because: 1 - You can live in it to cover your own living expenses 2 - Most of a quadplex is rentable units 3 - Tenants are very close so you can avoid paying for property managers 4 - Fourplexes still qualify for 'residential real estate' rates 5 - Quadplexes actually help you qualify for a higher than normal mortgage (via rental income)