1. Shelter from wind and rain: New Zealand and Californian breeds- the two kinds we have- are cold-tolerant creatures, and are fine with temps down to 20 below zero. They can't stand wind or getting wet, though- they will get sick and die. Colorado is a windy place. Since we've lived in our current home for a couple of years, we were familiar enough with the storm patterns and wind gusts to know they needed solid walls on the north and west sides of them.
2. Exposure to sun in the summertime: These same rabbits that can tolerate the cold cannot tolerate the heat above 90 degrees F. It goes above 90 frequently in the summer, so we needed to figure out how to shade and cool them. We placed the condos at a spot in the back that maximizes their shade from the tree foliage in the summer, and I am building a raised garden bed in front of them where I'll plant thick, tall-growing edibles to further shade them. By tilting the roof, the heat can escape, and we have vents at the top. The burrows provide a stable temperature underground as well, which they take advantage of sometimes.