Said differently, you won't need a special ADU permit to create an ADU.I'm interested in potentially purchasing a single-family home in eastern MA (Norfolk or Middlesex county), and doing this exactly.

I have heard Boise was cracking down on permitting, so make sure you can meet all licensing requirements and that you are in an area zoned for this type of use. 

If you do fall within either, you are permitted to ask if an animal is a service animal, and (if it is not obvious) what task(s) it has been trained to perform.

They really do stand out in a neighborhood plus I doubt you could get permits to build in a established area.Much easy to build on a larger plot of land in the boonies, which is where I see most of these.In the end, once you get them looking nice, you could have done a stick built house or even a log cabin if you can harvest materials on your land for about the same or less.

We have installed a permitted tiny house on the land, water meter. electric meter (that can accommodate a large house), and a 5 bedroom septic.

For example, RentRedi gave us some trouble in refunding a tenant's security deposit and the customer service representatives also notified me that there is currently not a way to refund a tenant's security deposit after 6 months once the deposit is made which concerned us with long term tenants. 

Whenever the context permits, singular shall include plural and one gender shall include all.

Relying on a home warranty = bad customer service to your guests.  

Terrible software, terrible customer service, and terrible company.

I would be following up with the municipality to confirm if zoning permits this.