Gentleman, @Matthew Coates @Leland Banner @Thai Foo @Dick Rosen thanks to one and all for your responses. 

This article draws a distinction between ESAs and "service animals." 

Then buy some 5 gallon buckets of primer from Home Depot and have the guys give a coat of paint(primer) to everything.

Went from a family with an animal to a single professional so that was a consideration.But vintage affordable still has wait lists. 

Just get them natural and put new coats one between tenants.

I usually ask the  basics income (3x rent) evictions ( decline) credit (700or higher felony ( decline) Pets ( usually  decline but if it’s a actual service animal and they pass the others I push it through) at a later date of the tenant proves to be responsible I can revisit the pet policy.

They are intelligent enough to know that they can't add anyone they want, they can't add animals, they need to clean up dog feces, their trash goes in the garbage can, etc.

With a footing rebar and a scratch coat, cutting  in the window digging the footing and laying then block is a few days work For one guy.  

Quick coat of stain every two years keeps it looking brand new. 10year old tub looks just as good as the new one.

Adding a ADU to your two lots is a different animal than adding a separate unit on it's own lot.