In Metro Detroit area, police will not remove these types of occupants (they are afraid of scamming landlord having police remove legal tenants), calling them a "civil matter" forcing landlord to start court eviction process.

With a PM in place, this situation should have been managed more effectively.

How can I effectively address the concern of losing Airbnb reviews when convincing a potential client to switch from Evolve to my local property management company?

You should have removed her at the end of her first year. 

LOC's can have negative effects on your future purchasing power if not set up correctly and keeping in mind you can "never" use an LOC as a reserve or asset.It will always be a debt burden and can over inflate your back end debt ratios depending on the W2 income and your liabilities.

I must admit their sales pitch is effective.

It takes actual thought and a programmer's mind to be able to build a CRM into something that's actually effective (sure a basic person could setup a phased text message or email automation, but it's tying everything together with opportunities, automated campaign re-entry/follow-up, social media integrations/automations, etc that is the real value).

Question: When buying an old building (constructed in 1900 with an effective build year of 1960), what should I look out for and ask about? 

My investment partners and I have made considerable investments in Mount Airy over  the past few years, worked with a number of brokers on acquisitions and can honestly say not a single one has been able to effectively articulate our neighborhood investment thesis which tells you how challenging the neighborhood is. 

@Dennis GallagherIt's my understanding that the "Income-Expense Ratio" primarily use operating expenses as the expense variable, which includes costs like utilities, property taxes, insurance, maintenance, repairs, property management fees, and trash removal, all of which are considered when calculating a property's operating expense ratio (OER).You calculate OER by dividing the total operating expenses by the gross operating income of a property.