If you delead, and maintain the standard, you will be in the clear.Here's the law (emphasis added by me):460.100: Duty of Owner(s) of Residential Premises (B) Whenever any residential premises containing dangerous levels of lead in paint, plaster or other accessible structural material undergoes a change of ownership and as a result a child younger than six years old will become or will continue to be a resident therein, the new owner shall have 90 days after becoming the owner to obtain a Letter of Full Compliance or a Letter of Interim Control, except that if a child younger than six years old who is lead poisoned resides therein, the owner shall not be eligible for interim control, unless the Director grants a waiver pursuant to 105 CMR 460.100(A)(3).

Yes, transferring title from an individual borrower to an LLC controlled by original borrower is exempt from Due on Sale- D1-4.1-02 of the Fannie Mae servicing guide, allowable exemptions-a limited liability company (LLC), provided thatthe mortgage loan was purchased or securitized by Fannie Mae on or after June 1, 2016, andthe LLC is controlled by the original borrower or the original borrower owns a majority interest in the LLC, and if the transfer results in a permitted change of occupancy type to an investment property, such change does not violate the security instrument (for example, the 12 month occupancy requirement for a principal residence).

Also, did you loan the money to him personally or to an entity he controls?

@Estefania Lozano Hi, by reading throught the comments and looking at the situation, and keep in mind this is my point of view, you need to have her go, give her the 300 back, it is nothing compared to the headaches and bills that will pile up such as, pest control, turn over on the adjacent properties, legal fees, evictions, I can go on.

@Jacques Edouard Dessejour LapierreYou can’t control buyers asking price.  

You need to get control of the property before they go see it.

https://www.soundmultifamily.com/blog/thoughts-housing-shortage/There are multiple reasons why we havent been building enough in Washington... increased regulation is the one that could be controlled the most but isnt (about 25% of a builders budget is just getting thru the red tape).

I personally don't purchase condominium since you can not control your cash flow due to the condo fee.   

If you have forced hot air, that’s enough to run the furnace controls and blower.

That's out of both partner's control.