Install new tar paper, shingles as well as vent as per instructions.If this is the first experience you've had with repairing roofs I would definitely consider having someone do this for you.

I understand that you cannot rent out a garage as a living space to someone else, unless properly finished and approved by the city, but could I live in it?

We’re getting a small shopping center installed supposedly by the end of the year (Marshall’s, Tractor Supply, Grocery Outlet) plus investments in a second “downtown” strip. 

everything you said is actually "not accurate", I really suggest you get good and proper education, join some PRIVATE UNBIASED alumni investment club and such.

I had a tenant give the proper 30 day notice that they will be terminating the lease because they will be purchasing a home.

You would add value to the unit if you could somehow install a window.

Additionally, the costs on installing parking meters please?

The source is likely from the bathroom not being properly vented while the shower is on.

House is rented out regularly but also has a 2nd homesite that has a septic installed & perked for 2 Bed.

My properties are all in San Francisco proper which I know like the back of my hand, and I didn’t want to exchange into a random NNN in middle America where I know f*ck all about the area.