All the rest can be subbed out unless you are doing a full remodel by adding square footage to the house/converting a space (bath/bed etc).

If you have rules in the lease such as furniture in shared spaces is fixed.

I think there’s some sort of option of to do a little refi on both house 1 and 2 and get the money needed to wipe out the line of credit(allowing for bigger flip opportunities, especially if I partner up with someone) and also renovating that garage space with the private investor as long as it is under 1000/month.

New roof, exterior painting, new flooring, bathroom updates, finished new living space What was the outcome?

Be really careful if you go this route, there are some shady actors in this space. 

The plant has added no value to the area during this time but rather has served as wasted space and an eyesore for residents.

I manage a "shared space" for a friend of mine.

Perhaps take a look at:  https://www.loopnet.com/ and see which types of commercial lease listings interest you and from there take inventory of which brokerage and listing agents are prominently features in the space that interests you.

My goal is to grow in the real estate space, and I plan to self-manage this property.

Matthew,Am just starting to invest in multi family space, realistically up to 50 units.