He holds all the cards and has no reason what so ever to cut you a better deal . he knows the area and controls it .

So far, the best place I’ve come up with to put it is in a bedroom closet.Is this in violation of any codes, or pose any other safety concern I’m overlooking?

The goal here is to cut your losses and get back on level ground.

That said, for some work in some municipalities, a licensed party must be used to pull certain permits with building and safety.

It sounds like they have different numbers and it’s not a cut and dry standard answer. 

Outside of covering that area with grass (trying to cut down on grass) or building expensive amenities, what could I do here to cover the dirt?

By cutting out the middleman, businesses can expand their reach and adspace sellers can settle directly on a price that works for them.

I originally thought about putting a gravel parking area along the front/side of unit D back towards A as there is a curb cut for a drive and 2 units are lower level and the entrance is on that side of the building (cost would be about $5k range for it but would be more of a ). 

Took their time , I pay extra for safety related issues. 

If you have low grade lumber trees call a local company that makes firewood and they will come clear cut it for you.