If you want to buy a pre-construction unit I'd rather try to find a project that just launched by a reputable developer (Mast, Related, etc) and buy really early to capture the appreciation that usually happens during pre-construction.

Are there more reputable lenders for this type of loan?

For general real estate stuff (including evictions) I have worked with Harry Kalogerakos, and Raymond DeBates, both are good, reputable attorneys. 

Quote from @Nina Sid: I just spoke to a few funds such as CRE Diversified Income Fund, Land Vest, Toro Real Estate Partners , Allied Land Investment, Phoenix Hospitality but I am trying to find people that have had good experiences investing in any of these or any other reputable passive investment fund with solid monthly returns. 

You want an accountant who can help you strategize and who is responsive when you want to know the consequences of the financial decisions you are making throughout the year.Good luck.

Also, if I place bad tenants frequently, I can count on being fired, so what sense does that make to ruin my reputation and lose other business for half or 1 months rent commission?

I do think Puerto Rico should work a bit harder to build its reputation as a travel destination (which is probably why they have created incentives like act 74, which offers tax credits on tourist/hotel type of projects), and they do have other things in the works I've heard are coming. 

If they are going to lie about something like this that has no financial consequence for them they are going to lie about other things. 

For BRRRRs, seasoning requirement would be a big hurdle as conventional generally has a 12 months seasoning now.If you're focused on building relationships, the best would be to find a reputable and reviewed lender/broker and talk to the account executives/originator.

Instead of cashing out your IRA with the consequences of penalties and taxes, keep your money in your IRA and use it to invest.