Your fiance may be able to negotiate a lease extension with the new buyers.Good Luck  

NIcky Redear is right you probably can't enter into contract until you're 18 unless you're an emancipated minor, but look at the bright sight you have all this time before you turn 18 to do extensive research and safe money for your first great deal.

Extension fees?

One side may be month to month as most lease term revert to month to month unless an extension is signed.  

CCRs not only cover "if" renting is allowed, but outline the rules for owner/renter conduct.

Per contract, we have a closing date of 2/17 but the title company is now stating this date is pending their title search, and that if we reach that date and the search isn't complete, they may file an extension.

@Marky SuazoMy recommendation for a long term investor that has concerns about an extensive rehab is to be very conservative when budgeting funds for the carrying cost during rehab. 

*Understanding "delayed settlement", "possession and rights of entry, signage agreements, right to market and right to auction.It is SO important if you intend to make serious money in the wholesale real estate business that you conduct your business with ethics and full disclosures.Be honest in all your marketing exposure to sellers.

@Johnathon Kim Since you did not specify a location where you are seeking GC References, I will provide you a list of questions to ask that will allow you, to conduct your own Interview Process.

There should also be clauses to allow you to conduct your due diligence.