When you buy them you can see if they are ADA compliant.

We routinely offer to change out toilets to chair height (also known as ADA height).

You have every right to require her to prove she has a disability, under this act, that requires a service dog.You would be required to allow a service dog, to someone who is disabled under the ADA, if they asked for a reasonable accommodation for their disability. 

Is anyone familiar with the ADA or fair housing act and it would allow us to be covered to allow this house to have all 10 members in the home without an issue.

Instead of spending thousands on an ad a bunch of people are not likely to see have a free try us out day where they get one item free with purchase of another item. 

A service dog is covered under the ADA and you cannot enforce restrictions without violating that.  

For civil I'm good with getting the rough grading to where it needs to be and ensuring that the sidewalks throughout the site are ADA accessible but any more than that I want a civil involved.

Your problem is not that big, if I were you, find a house out there that has enough space to go for what you need, use your 1.3 to buy it and your 300k to get a construction loan or just the 1.3 hopefully will be enough. it is best that you keep all 3 houses, if you sell to investors your 1.6 equity will have about 1.2 value at max, you lose 400k at a minimum, im assuming 600k loss due to the ADA capable home being converted back to a non-ADA to be sellable.

I have begun to create a postlets ad and will do craigslist ad as well as do a Facebook ad.

When I went to setup a facebook ad a week or so ago it denied my request for some reason and I still need to fix that.