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.       

should just be the RPA/RIPA & AOAA Form - you are still going to have to do the PRBS, BA & AD as with any transaction (part of the RPA/RIPA)That get's you into the Purchase Agreement...after that, all the normal disclosures

Postlets is now Zillow Rental Manager -- integrated better into Zillow.... awesome app and you can use the HTML code to generate a Craiglist ad as well.  

I would look to your building codes for new units as to the parking requirement, with the ADA, larger complexes will be effected as to the parking count per unit. 1-4 single family may not be covered but that should give you an idea of the statistical requirement based on concentrations.I would want at least 1 1/2 spaces per unit with a 1-4, meaning 6 spaces with a 4plex.If this is "downtown" your market may be different too, many urbanites walk, take public transportation or bike and won't own a vehicle, look to the make-up of the tenant base.Look to comparable units and what parking might be.As to valuation, parking space adjustments will be objective, guess, I would use the cost approach of adding additional parking.

I can ask for ESA paperwork (but not Service Animal paperwork) as this does not fall under ADA, but does fall under Fair Housing standards from HUD which is why I couldn't deny the ESA. 

As you know, small multis are in short supply in the Treasure Valley and get swallowed up very quickly.Give me a shout sometime and I would be happy to discuss how to  implement your strategy in the real world in Ada County.

@Jeff Kehl I think I will try the Craigslist ad. A

ESAs are not service dogs and are not protected under the ADA.