Their main motivation is worry about being sandwiched in by towering new home construction. 

Business the right way.You could reach out to the wholesalers share with them you appreciate them marketing your property because the main goal is to sell the property but the way they are going about it is unprofessional and violating Florida laws.

I assumed the same rent range and only slightly more than $40k, mainly because of an allowance for windows. 

I suspect this house would be more in the $6K range for a basic unit that is large enough.So, what I did instead, was put window units in the main living room and one in each bedroom.  

The main focus is rooms where work was done, but other rooms are also tested during this process.  

My feeling was that any and all of them would be better than working with a larger firm where SOLO401s are not a main focus. 

Noise would  be your main issue with up and down flats where the floor is timber , wood panels or anything not solid. 

For my first investment, I am looking to focus mainly on condos and in hopes of trickling into multi-families.

The main strategy at first will be to sell real estate option contracts and consulting services. 

This is a tax question for the situation where the main house is 100% occupied by the owner and the carriage house/ADU is 100% dedicated for Airbnb renting (never used personally).