Because the main value an agent brings is experience.

For example, if a 1,600 sq ft main house is appraised at $100 sq/ft, what could I expect a 600 sq ft ADU of similar build quality to be appraised for?  

Because that is your main focus that will be important to get right. 

Your main focus is to get another paying tenant in there and you can focus on the judgement after. 

We mainly use it for laundry but don’t use it much otherwise.I wonder possibilities of doing STR for winter since I live very close to ski resorts.

BUT when the market in high appreciation areas like San Francisco and NYC tanked, mainly due to work from home and high interest rate, I sold my lesser locations in 2021/early 2022 (still a market high, even in my market San Francisco) and kept the best locations debt free.I could easily leverage again now, but I don’t think we’re going to have the strong appreciation runs that we have had since the mid 1990s.

Every deal is different, and supply and demand really dictate what we can sell it for.

I'm considering buying a property in Southern Maine that is about 5,000 sq ft too small to legally subdivide per the town's zoning rules.

A place to sleep, shower and shelter a bit, while not doing all the outdoor stuff that are the main attraction anyway.I particularly see the appeal if tiny homes can be added to the land of an existing property.

Nobody can sell your services as well as you can, mainly because people, especially when trusting a large investment, like speaking with the owner.Also as eluded to above, what is your experience?