So selling this property would undoubtedly lead to a pile of money sitting and earning nothing in the next several years, and not being redeployed until I'm ready and have the time and energy to devote to starting a real business out of this.  

Your post really shows how a little bit of knowledge and planning can reduce the tax burden... 

They could ask for an out if they're unhappy with her service, a reduced timeline, an exception if they are working with an agent in a different market or for a different product in the same market (example: one agent for their residence, a different one for an investment property), if they buy directly from their uncle who is a builder, etc.

That just reduced the number of financed properties.If you're married, shove each loan into one spouse only.

That will help reduce the overall premium as well. 

Your “feeling” could be you hating lol I think you might need to release all that negative energy and put it into yourself and hard work!

., I haven't heard that term either, but a quick Google search reveals it basically means making it permanent so the bank can't close or reduce it on a whim. 

Current financing available, construction costs and how to reduce them, appraisal trends, best practices when building on investment properties, rental values, design trends, how to minimize the construction time, ideal target markets, which city's DOB's are helpful and which aren't, preferred vendors, etc.

If you can't Airbnb it, I would suggest offering them a reduced rate to be able to keep their stuff there for the summer.

Where this catches people off guard is with the modern energy code.