We are not entitled to opinions that support illegal housing discrimination on these forums.60% of all fair housing violations are for discrimination against the handicapped, and typically for revolve around service animals. 

Landlords need to pay cash and the amount differs whether the unit is rent controlled, the tenant is old, handicapped, etc. 

Tenant said on 3rd day after signing lease that we have to modify it because her handicapped dad wants to move in.

This was most likely installed to be handicap accessible but for some reason renters do not like it vs the traditional style.

The appreciation is going to be handicapped because the property is rent controlled.So to summarize in rent controlled areas you often purchase with little or no cash flow and no reasonable way to significantly increase the cash flow. 

Now after you own 4 or 5 rentals you might need to buy taller toilets or handicap accessible toilets that are $200 or $300 each. 

I don't have personal experience with this, but some initial thoughts:ADVANTAGESCould be a longer term tenant than a normal tenant.Meeting a much needed housing and service shortage.Should be able to charge a premium rate compared to traditional renting.DISADVANTAGESInsurance could be significantly higher, to have any business but especially a business with more risk of falls.More wear and tear on the property with likely more occupants and maybe more damage.Guessing a lot of these businesses don't survive, it's harder than people think it is.Potential added expenses to accomodate business use, handicap access, potential commercial kitchen set-up, etc.

Not sure if I should pursue it.  1) Is there a rental market for Handicap accessible houses?  

So, since this is the perfect place for disabled or handicapped person.

Redbud is the name of the 16th hole at August where Tiger chipped in so yes I'm a huge golf fan and a 5 handicap.