Now I just need Tenant C to signed addendum stating that "The pet deposit may be used by management/manager for any damage related to the pet(s) and for ANY other monies owed by resident under the terms of the lease and for physical premises damages, whether pet related or not”.  

If you have better comps, that is closer proximity, more recent sale date or lease info dates, and more similar in location, physical characteristics etc, that is what you need to challenge the appraisal.

My workflow necessitates a physical notebook next to me at all times.

So, based on what you describe, you have a legal quadraplex (4-unit property), which is physically made up of two 2-unit buildings on one legal parcel. 

i’m looking for the 5 best physical BOOKS to read. let me know your favorites!

With each, the opportunity has been around looking to build value through either physical or operational improvements. 

Physical Considerations:Is the property suitable for your event space business in terms of size, layout, and aesthetics?

(To me) asking these questions online seems like playing roulette (maybe Russian roulette).You could have an attorney guide you through the physical steps of the process, and make some recommendations, but ultimately the buck stops with you.

They are noisy, have verbal altercations (and there was one physical altercation involving a third party), have smoked in my unit despite it being a non-smoking property and do not maintain the grounds as they should.

It's virtually impossible to buy physical precious metals (for delivery) anywhere for any reasonable price. look at pretty much any asset.