It's illegal in almost ever circumstance.

So yes I very much agree that political and legislative risk is one of the largest risks we deal with in real estate; but even in extreme circumstances, opportunities would exist (with completely different business models). 

Due to circumstances unforeseen in 2019 when I applied for the permit I need to sell before the 12 months is up.I paid my attorney to look into the risks associated with this and the fact that I signed the permit application with the intention of staying in the home, but now there is just no way I can stay there.

Total "return": ~$35k.Everyone's circumstances and risk tolerance are different, so there are definitely arguments to be made for the $400k house.

Obviously these vary depending on credit score and should be used under certain circumstances where you have other income sources to pay the loan if the project doesn’t go right.

@William Lynch  unless your kid locked you out and wouldn't answer the door, or you had some crazy circumstance other than you just locked yourself out, they will probably be unsympathetic to your cause.

The above opinions are valuable too, just letting you know my circumstances.

Some extenuating circumstances have popped up and I would like for my tenants to move out within 60-90 days.

I have been in similar circumstances but they take time to resolve 

Are there circumstances that would prevent you from going back to the seller to remediate before closing?