And using the process buy a new property or properties that you also intend to hold for investment use.The issue for you might be that you purchased this property with the primary intent of selling. 

Traditional lenders won’t approve it, and hard money lenders who offer this type of financing all the time look for experience, assets, or strong equity in the deal.Partnering with someone who has financing or experience is realistic approach when starting.

If you do that once it's a problem but six times and perhaps more you probably shouldn't be in this business. 

Yep, been doing it full time since 2018ish.

And more importantly did you disclose ahead of time to the applicants there is a charge?

Air Bnb and short term rental properties were very popular at the time.

Mortgage recasting, also known as re-amortization, is a process that allows homeowners to lower their monthly mortgage payments by applying a lump sum toward their principal balance.

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!

I would also add, a contractor that you can buy materials for and they know how to put them in with little to know direction (reduces the management time of the project).

You may have to pay the tax and then bank the segregated depreciation for a time.