Quite frankly, if I were in your shoes I would try to get one of my siblings to buy me out and then invest that 40k somewhere else.

I have some family ties to the area. 

I just want to explain my circumstances and see how people with experience and knowledge in real estate would move forward if they were in my shoes.

The goal is to keep these for rentals.I currently own the land personally and am funding the builds with a combination of HELOC and cash - no bank debt tied to these properties specifically.

My employment is tied to my office in London at the moment. 

-Creates a solid foundation for passive income, allowing you to reinvest future cash flow into other opportunities without as much financial risk.Cons:-Ties up a large amount of capital that could potentially be used to generate higher returns elsewhere (like another STR or other investments).

I'm sure someone on here has been in my shoes, right? 

Not sure if this will go against the culture here but if I read correctly and you are considering tying up your primary residence to an investment property please reconsider leveraging the home your family lives in. 

To permanently affix a mobile home to the ground requires a foundation - just “tying” it down doesn’t qualify.  

For example, one exemption is tied to your total revenue which is $5M in gross sales or receipts in a calendar year.