Oh, it's great to be a landlord. You collect rent from tenants who adore you, you please your financial planner, you form lasting friendships and your phone only rings between 9 a.m. and 5 p.m. Unless a unit's hot water heater breaks in the middle of January. Or the sewer system explodes over the weekend you're in Maui. Or a tenant decides to start an indoor drum circle. Once you understand your legal responsibilities in the landlord-tenant relationship, you can better avoid any potential problems.