A lot of the major components are brand new including roof, siding, furnaces, A/C, flooring.

This remodel included all new plumbing, a complete bathroom gut, all new flooring, exposing the brick fireplace, all new appliances, paint inside and out, etc.

However, the specific details can depend on various factors, including the type of asset, how long it was held, and any applicable tax exemptions.

Common fees will include a set-up fee, a leasing fee for each turnover or a lease renewal fee, marking up maintenance, retaining late fees, and more.

Understanding the nuances of the "A to B, B to C" close, the contracts including assignments, what types of financing one can get for each property, etc.

I am also including the taxes and insurance while running the numbers.

All our rental units, including our small units, have tanked water heaters.  

It's a split level that I bought in original condition, including a 1984 ancient-looking air conditioner and all the things that come with a house of this nature.The plan was to do a full cosmetic + replace HVAC and Roof + prune back 60ft tall pine trees AND turn it into a house hack bnb.What I've learned so far....- Trust but VERIFY everything on the buy side.

Some of those include Liability. 

As far as negotiating furniture, I would include “furnishings negotiable” or “comes furnished” in a contract.