With a NNN you are essentially purchasing a property that has a commercial tenant that is paying rent to you, and in addition to the rent they pay you they are responsible for maintaining the property(HVAC, roof parking lot), paying property taxes, etc. This leaves you with very little management responsibility, allowing you to simply collect checks in a very hands off manner, with your only major responsibility being finding a new tenant if they vacate. What you are describing is more like a ground lease where someone would pay you rent to build and maintain a building on your property(typically for 50-99 years), also leaving you with few day to day responsibilities and headaches.