Condominiums come in all shapes and sizes. Our website organizes them in this fashion: Ranch: One-story building which houses several units side by side (3 or more units per building) Upper/Lower: Two-story building that houses several units that are all one level (either on the first or second story). Duplex: Can be either one story or multi-story structure housing just two homes (side by side) Townhouse: Multi-level building (2-3 stories typically) with 3 or more units (side by side) per building Midrise: 3-5 story building that houses many units on each floor. Highrise: 6+ story building that houses many units on each floor.