The developer is a charity that I support, however, I still want to establish a fair price.

You need to decide if you are operating a business or a charity.

I have a charity golf tourny on the 17th.  

Find any local networking groups, charities, or meet and greets and start participating.Part of real estate, or any business, is people getting to know and trust you.

Charity 

Charity

Thanks Charity, I work in the public service sector and I understand what the news media try to portray.

My wife wants to have low rent apartments for the ESL parents of the students she teaches, and she can't get that until we can afford that kind of charity.

From working on these projects and interacting with care providers, charities, and government sources, one thing I've learned is that assistance for people (like your tenant) is out there.This helps you because it means that more appropriate housing for him may be available allowing you to place a better tenant at a higher rent, or that someone other than you or your maintenance man could help with cleaning.It will take a little time and effort on your part but will be worth it because of either the increased rent from another tenant or the overall improvement to your property.* Plus you don't risk running into any potential issues requiring lawyers.

Try to find a local charity that installs those wheelchair ramps for people in need.