@Bryce RichardsI’d be more concerned how you’re going to make money on that dealWith continuous delays in construction and supply chain issues, this project could get very very expensive

Apologize for the delay, send them a $50 gift card to a local restaurant and tell them you hope they enjoy the new bathroom. 

I was able to arrange the funds to buy it all cash from a private lender so the closing costs were minimal.

Mid-term rentals come with a much higher predictability, there's huge demand for them in the Cape Coral area, and you can minimize the wear on your property with lower turnover.

Don't delay. 

The basic process is illustrated below.To keep this post in a reasonable length I will focus only on the first 5 steps, which if done well will make the remaining steps minimal effort on you.Define Your Goals and Resources"If you don't know where you are going, you might wind up someplace else." ...Yogi BerraWithout defining your goals, it will be hard to know where to start the journey and to see whether you can reach your goals.

They were thrilled they were getting a good deal on a brand new luxury apt, and I was thrilled I can start the next renovation without any delay. 

But the process of getting a green card is being delayed too long.

We began meeting with the seller during March 2020, the beginning of Covid, and were set to close the end of August 2020 but that was further delayed 5 months as a result of hurricane damage to the property.

If you do the math and show them how much they were "missing out on" (which is going to be very minimal) it will help put it in perspective, and I would imagine they won't care so much about the missed interest, and more so about getting back the original security deposit amount.