I’m not sure how to deal with an extortion blackmail Letter, which this seems to have that flavor and what they are sending out to people. 

if there is appreciation, but you wouldn’t sell your current home tax free and buy a neighboring home to rent out, (There by raising your cost basis for additional depreciation and lower capital gains tax.) then it probably doesn’t make a good rental property. . 

If you prove you have the knowledge to help there, people will DM you without you having to ask.

Based on that number of units I would expect much higher figures - did you buy these buildings all/mostly cash?

If you're in a high-cost area, consider out-of-state markets where you could buy a rental property outright. 

As my wife is a realtor, we’ve helped several people from Bigger Pockets find their second home/STR.

@David LewisRecommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

Can you find a way to capitalize on their work even if you don't buy "their deal".

HVAC move to attic to replace package unit and other side replace fan and heater for about 20k8. redo plumbing work 20k9. spent 10k to fix sagging floor issues by putting concrete blocks in crawlspace.There is big neglected strip mall in back as attached with loud noises and some weird smell of tobacco etc. also has big dogs barking at people even if I go to the corner of my backyard lot.There is one bad neighbor who has big dogs always barking who elevated his backyard and rain water runs naturally towards my sideBig trees other side in neglected waste land which I think belong to strip mall owner behind and city also pushing some rain water in to that waste land.I am in dilemma now1.

I use excel , but many times I forget to add any expenses and then it messes up the calculations.How do experienced people do it ?