It is easy to react quickly & fearfully when you get a letter from a lawyer threatening litigation, especially when it comes to land rights.

Changes in the neighborhood that threaten your appreciation.2.

I lived at a condo where many owners fall behind on HOA fees where they have to impose special assessments to cover needed repairs, gas for heating where they were six months behind and the utility threatened shutoff.4.

@Daniel DietzThe irs has been threatening to update their fmv/NAV guidelines  for the past 5 years.

(I didn't technically lie because I did call the law firm and found out that they wouldn't take on cases with less than a $100K lawsuit.)Then I went to the California State Attorney's website and threatened to report him.

If you get a good case worker sometimes they can leverage compliance with threatening rescinding the voucher.

I am thinking my next step is probably to threaten then execute suing for the money owed ($571 rent + late fees = $1,000+). 

I let them go for a couple hours and stew, then one threatens to call Code Enforcement... oh boy, another code enforcement game.   

Once you threaten a lawsuit he might just tell you to get in line. 

Threatened with steep fines, after sending the certified letter, the threats disappeared, as the city (in this case Los Angeles), decides they don't have the budget to fight the US federal government in court, and lose (which happens every time the feds have defended the Fair Housing Act).