Great size for one cat. The top tier is just a few inches above the upstairs window ledge allowing her to watch the whole side yard. She doesn’t use the condo to sit in, but she hides things there such as my tablet stylus, a plastic bag, toys, etc. She uses the middle seat to pounce on her toys from above. She’s 10 pounds and fits fine on the top turned in either direction, sitting or curled up. I have it against the wall rather than in a corner and it’s very stable. We recommend.