ADU in southern Maine seacoast area without owner occupancy requirements

[Nicholas Chagnon]

I am looking for my next real estate investment in the seacoast area of southern Maine. I really like the idea of buying a home and adding value and cashflow by converting an area into an ADU but every town I look at seems to have the rule that the owner must occupy either the ADU or primary home.

Are there any towns in this area that you know don't have this rule?

Is this a general Maine state rule? I have seen some towns in New Hampshire that don't have this rule and some that do.