Need help asap!!!In the verge of losing garage

[nyc240sx]

Ok heres the thing ive been renting this garage for almost 2 1/2 years since then this woman that lives around the corner constantly harrasses us saying we do commercial work there and that the 240sx in the driveway dont have plates the car is on private property. I fix my own cars is it still considered commercial?
So recently she called up the buildings department the owner of the house got a letter stating that they want to come and see the garage inside. My other s14 is inside that i am putting together i have the dash out of it and the rear subframe and fuel tank in the process of putting the rear back in but not the dash i want to leave it out until the motor goes back in so i can run all the lines into the car without a problem. Any help will be appreciated very much!! I am also looking into getting a lawyer.