http://www.ada.gov/svcanimb.htmBusinesses may ask if an animal is a service animal or ask what tasks the animal has been trained to perform, but cannot require special ID cards for the animal or ask about the person's disability.If you have additional questions concerning the ADA and service animals, please call the Department's ADA Information Line at (800) 514-0301 (voice) or (800) 514-0383 (TTY) or visit the ADA Business Connection at ada.gov.Ofgift

The ADA says Service dogs and ESDs must not show aggression and be under control of the owners at all times.

I've been working on a business plan for it using the senior living housing model without the ADA/medical component. 

@Wendy BooneYou might be able to use stock ‘architectural’ floor plans, but the site architectural plans (for example, site accessibility) and all of the engineering disciplines will need to be custom for a commercial project.Beyond the conditional approvals in place, the local authority having jurisdiction (e.g. city planning & development dept) will be focused on fire-life safety, ADA compliance, etc. per current building code.

The placement is powerful because it does two things assuming you place correctly, 1) tells people where to go to find your ad next time and 2) positions your ad as a focal point.

Thanks for that, but again, most of the available information, and even cases, associates the language of ADA and FHA or discusses the differences between ADA and FHA.

The only thing that makes a medical building different than any other building is the following:1) ADA rules - make sure your building is ADA compliant.

ADA doesn't specifically apply to residential real estate, but this could help you out.  

Posting in Craigslist can certainly be profitable - especiallyif you are in an area that is free to post in.The Key is that you must be a great copywriter to compel usersto open your ad and continue reading, and respond.Then --systematize-- posting your ad as frequently as Craigslist allowsso it only take you less than 3 minutes get in, post, get out.

Consider calling the ADA hotline and ask your questions there.