For reference I would have only been able to rent the space for about $900/month.

I am not a pro in that space so I may be wrong but that is not what I am seeing. 

This is a Maryland Historical Property, zoned for residential high density, with specific limitations on its usage due to its zoning.The property is massive, offering 8,276 square ft of space, including 5,445 square ft of finished area, and it features a substantial driveway.

While it’s true that ADUs might reduce yard space or parking, the additional income stream easily offsets these downsides.6.

If this isn't a separate dwelling unit you can't take losses from the rooms / space you are renting and use them to offset non-passive income (Section 280A of the tax code)Rental expenses are limited to the amount of your rental income and the balance of rental expenses is carried forward. 

which seems rather 'overpriced,' for an REI venture with a handful of people or less (in most instances) using the data lines and server space, etc. 

Other than FICO, which is universal in the space for rates (outside of lenders who don't use credit), what other factors can you use to lower your rate.3.

There is also a lot of space in the hallway that can be used; however, I need to obtain the approval of all other residents since that space is shared.

However, you can expect to recover about 50-55% of your investment when selling the home.Another good option would be to consider converting attic space, finishing a basement, or repurposing a large living area to add a bedroom without expanding the home's footprint.Some other tips to help you save on materials while still creating an appealing finished product: buy in bulk, shop at discount stores and outlets, look for overstock, discontinued items, or slightly imperfect materials, attend auctions and Estate sales, incorporate reclaimed wood, vintage fixtures, or other salvaged items for a unique look at a lower cost, build relationships with suppliers...If you have any more questions or are looking for funding please feel free to reach out to us, we're a private lender.Regards,Jackson

So, yeah, I get it, it's been a good setup for both parties.That being said, (and perhaps this is my naivete coming into this new space) the fact that after all this time they decided to outsource the lease renewal negotiations feels like a "them" issue and like a one-off fee.