If this were my house I would send the maintenance crew and check it out to see what the issue really is. 

Don't blow it all on one deal.I like that: "Cash is your Ammo".It really is.How to make a toy coin gun from a cardboard box: https://www.youtube.com/watch?

While you usually don’t have an issue renting unless a neighbor turns you in, it won’t carry the same value for a resale if it can’t legally be used as a duplex. 

I've never heard of anyone needing a rental license before unless they were operating as a short-term rental on a platform like AirBnb or VRBO and their city/county requires them to be licensed for vacation rentals.For a traditional rental I'm not aware of nor do I see any reason why it would be an issue. Renting

Exchanging on the secondary market could be relatively costly, but you could look into 1:1 redemption from the stablecoin issuer or its partners (e.g., Circle for USDC. 

Cold calling, letter writing, driving and knocking on doors, running billboards and bus stop ads, posting cardboard signs on electric poles, etc.  

If  I   use rental financing (accepting the higher rate)  and then declare it as primary residence for  the 121  exclusion is that an issue- re the loan and potentially the case for the  121 with the IRS>    If i  refi my present home to gain the funds  then  there is the issue of jumping to the secondary residence and trying to declare as my  primary re: the loan? 

I also checked the baseboard heaters at that time and noticed she had plastic drawers and a cardboard box right up against the heater.

Get a large 50 x 50 thick cardboard sigh and stand on a busy internection with the words "We Buy Houses" along with a phone number7.  

Just because it's 12mm doesn't mean it will last. 90% of the thickness is glorified cardboard.