You can find a bunch of lists that mention top amenities such as hot tub, sauna, etc.

Michael,   A good book to purchase is "Professional Real Estate Development: The ULI guide to Business.   

A quick check of new listings results in many listing that seem well below market rates.   

Assuming you want to aim for syndication, you sort of need to learn how to develop a pro forma that ties the return to an IRR/XIRR. 

Do you want to buy and hold for long run appreciation, do you want day 1 cashflow, are you wanting to flip and stair-step into higher value properties, the list goes on. 

I believe it is over priced (originally for sale by owner for $280k,later listed through agent at $360k), but I feel like the seller may be open to a creative financing option. 

That is smaller units built with higher density to make the numbers work for both buyers and builders.Adapting to these challenges isn’t easy, but it’s necessary to keep up with the market.What are your thoughts on how builders and developers can address affordability and supply issues. 

Charming, smaller coastal towns with a slower pace of life, natural amenities, seclusion and semi-self sustainability are high on the wish list of many high level clients and investors. 

I wouldn't call any of the fees you listed above as extra. 

It gives you a list of all the assumable mortgages in your area.