They'll want to sit and watch TV, drink a beer, and have "just one" inside --- because you'll never notice, right?

I would simply capitalize that up front so as to compare apples to apples.First your increase or decrease will ONLY affect value not the cap rate,  The cap rate is set by the market. 

.)- Lawyer specializing in landlord tenant law (again you can use your landlord association and get familiar with local laws for bad debt collection, evictions etc)- Police department, do they have community outreach programs that you can join to decrease chances of crime (Cameras and lights are great, but prevention is best!)

This property has tax liens of about 14k as well as a Blight Notice.

I draft all correspondence, rent increases and notices. 

You need to use proper legal notices and follow the landlord-tenant laws for your jurisdiction.

2015 LOW INCOME HOUSING APARTMENT CAPITALIZATION RATE: 10.0% The Appraisal District is giving public notice of the capitalization rate to be used each year to appraise property receiving an exemption under Section 11.1825 of the Property Tax Code for Organizations Constructing or Rehabilitating Low-Income Housing: Property Not Previously Exempt.

Given the Amazon fulfillment center development, I would expect property values have increased and cap rates have decreased.

I posted notice to vacate.  

We have already posted the 3 day notice.