If a judge considered ADD a handicap, it would be ridiculous but these days everyone is handicap or some quack tells them they are when they are in grade school scaring them for the rest of their life and feeding them pills like the chief from one flew over the cuckoos nest. 

On the other hand if you make improvement to the property that are a benefit to the handicapped, your property will be a value to future tenants also who need those features, and very few properties have those features. 

I don’t know if you can move on to new tenants during the process. ps they aren’t failing to provide insurance because of the handicap.

It comes with a 10-20% built-in expense/handicap/inefficency and people often seem to forget about that.

You are handicapping yourself by doing the single family first. 

Mentally handicap some houses and see where they move at and see if you can catch them when they re-list once done and see what the ask is. 

Some trash companies have a service for an extra charge where they will wheel it out to the curb, because handicapped and the elderly often can’t do it.

In one case the person was counting on using the income to take care of a handicapped child and their financial needs.

Trenching, utility connection charges and etc. add a huge cost handicap which makes the economics unworkable in almost every case. 

One booking 6 weeks from now really handicaps your ability to book MTR guests.