However, in my opinion, and experience you need to learn and gain a great understanding, of the various municipalities, with respect to demographics, pocket market appreciation/ depreciation, pocket market economic factors, demand for the need to rent, the needs of tenants such as close access to transportation and shopping, vacancy rates, etc.

Clearly, the septic system is part of that.You'll get a large range of opinions regarding the frequency of required cleaning.  

Thanks in advance for your replies/opinions!

I see people paying around Zillow estimates (Bad idea in my opinion), I see investors purchasing right around the ARV, but...

Just my opinion...everyones goals are different and every deal is different.

So here’s what I’m guessing happened:You told the seller’s agent to spook the tenant -> Seller’s agent spooked tenant -> Tenant is acting like a spooked tenant At this point, it wouldn’t matter to me what someone else’s opinion on the tenant is.

They are way easier to work with in my opinion and as you grow, they will be more willing to be creative with your future deals if you keep a good track record. 

The upside is the maintenance costs go away for the most part.My personal opinion is just polishing the concrete slab will still look like concrete.

Lee county, lake county or pinellas county are some of the best in my opinion AS of today's market.

Though this question does not require such action, you can always reach out to the IRS for an opinion.