Go in person to the planning department and talk to them.

Note that Sec8 comes with added costs & issues due to bureaucracy and state of the HUD departments in the area.

I called the zoning department and they are telling me this is a Mixed use building (N zone).

I just got a notice from the MD department of assessments & taxation that the value of my property will increase from 120k to 261k , spread out over 3 years equally.This is a ridiculous increase of 118%.

Class midwest issues. 

Called our local sheriff department.  

Fire department is the toughest one to deal with.. 

Find a lawyer and issue a lease violation for other issues such as excessive noise and furniture removal.

Does the city or building department not post the property with a big red  stop work poster ?

Henry Clark had a great response above, but you can also just reach out to a Planner in the City Planning & Zoning department if you are still unfamiliar.