Personally, I own 1 keep, 1 large tower, and several smaller houses. The most I have ever owned was 1 fortress and 2 large keeps, with some smalls here or there.
I have a large brick. I like it. My view doesn't get obstructed by an upstairs. I don't need no courtyard.
I own 1 Tower, 1 Keep, 1 Fort. My tower is right outside Trinsic and you can use the bank from inside. My keep is secluded by itself in the southern jungles of Trinsic on grass. My Fort is just outside North Vesper on the road. All my Courtyards are 100% secure. I have many smaller houses to block off my compounds. 3 Smalls, 1 Villa and a Large Brick. 8 homes in total, 3 seeing regular use.
I made it to the 1%? Wooohooo! Yeah up until about a month ago I had two forts. Just have one CY house now.
I don't have anything bigger than a Villa this time around. But I am refreshing a dozen houses for friends who as usual said "UO? YAAAA" and then only logged on 3 times... Don't worry they are all smalls on my own bloody island. Well mostly there... but they are all Villa or smaller.
I own my keep, the A^T Guild Hall, the A^T Library, A^T Outpost on Skara and the A^T Outpost small tower at Destard. The fifth one is just for fun and I'll probably sell it (again) eventually. The other four, well, not gonna get rid of them until I'm banned or die RL.
I only have 1 cy house (a fort with 2 bridged towers). I have many additional houses, but this is the only one with a cy. WAIT! Am I officially 1% now?>