Obviously in the other end of the spectrum than your developments.  

If they fail to pay the new full amount send a pay or quit for the missing amount with late fees.

I hired Jenny Yi to design our latest STR in person, she demanded that I pay the full amount of her services upfront, $7,500, which I thought was strange as we are used to paying half upfront and half once it's completed, but proceeded anyway because a couple of people recommended her.

I started my professional career in medical device sales and still do that full-time.

Went through extra fast because the developer really had no other good optionsI doubt we'll know the full details for years to come but I'm curious if you have an opinion, or if there's other probable options C,D,E I could be missing as just a public bystander to the situation @Rene Hosman It's very rare that anything gets done quietly behind the scenes.

You should have received your full payment, so give the cleaners their fee.

Full stop.An investor can buy undervalued RE, do efficient improvements and create massive value. 

I also work as a RN and looking to transition to real estate full time eventually.

However, I don’t have a US-based W2 (but work full time for an American tech company in their London office). 

Quote from @Ricardo Polanco: Good evening everyone, I am evaluating the possibility of buying a multifamily property in Scranton, at this moment it has 2 apartments that only need cosmetic repairs and it has a big 2nd floor unit that needs a full repair.