Tim, Since I didn't get the data I needed to make a reasonable conclusion to your problem. My suggestion is to change the grass type to a more drought tolerant grass like Bermuda or Zoysia that can be mowed to 1" or less. This then makes a wonderful lawn to play soccer or even practice your golf game. Remove the center rotors from the lawn so people don't skin themselves sliding over them. JMHO Aloha

Italian cypress

Prism: You might do some reading about a tree called Chinese Pistache. This may fit your criteria except potentially being larger than 20 feet. My only question is whether or not it can handle the wind. Good luck. Kate Here is a link that might be useful: Pistacia chinensis

suzi-yes that's right they are rectangle. And I am aware that I'd have lost a triangle (that would be my wasted space that I didn't need for anything) - and the circle in the rectangle does have some wasted space on the 'corners' anyhow. I thought it out and was prepared to do that. I just offered up what I have and what I contemplated as an option in case it was helpful for the OP. I would have been more than happy to do so and it would have housed the stuff that I have in my kitchen just fine, wouldn't have missed it a bit and susans are pricey. Some people love them, some people like them and some people just don't have them. You don't have to have a susan as a solution. Space calculations have been done showing that it's not really the loss of space that it can appear to be. I am okay with not preferring them even though many or even most enjoy them and find them useful. closing-off-a-blind-corner calculations beth09-I know it! I actually have a drawer stack that's somewhat empty - hahaha. It is a shock to the system. You will find what works for you. I will say the super susan (no pole) pie shaped does seem much sturdier than my old regular susan with pole.