If the dwelling has no mailbox and has a keyless bolting device, alarm system, or dangerous animal that prevents the landlord from entering the premises to leave the notice to vacate on the inside of the main entry door, the landlord may securely affix the notice on the outside of the main entry door"

Here in MA if it is determined that you have these devices on a tenants CB panel you may have to pay their entire electric bill from the day that they moved in.

Thanks @John HauserI know for larger multi-family properties you can also add a device to the water pipe going to each unit (it's about the size of a pack of cards) which separately meters the water.

The property is actually located in Washington DC in an “emerging area” with clear signs of revitalizing, i.e, near new development/ plans for construction of professional sports arena, etc.

I have a BS in Exercise Physiology and certifications through the American College of Sports Medicine (ACSM) as an Exercise Physiologist as well as Group Exercise Instructor.

WASATCH COUNTY (near local public high school):3-bedroom: $245k (not including any other closing fees), projected monthly rent $1,600+, monthly HOA $125+, onsite property management fee (screening, leasing, marketing, managing) $100/month, common/shared swimming pool and sport court.The market in Utah is not as prime as most markets but I'm choosing to stay here with my first investment.

I would install a deadbolt as it is an essential security device but nothing more. 

Real estate is a team sport for both rookies and the most experienced - a good opportunity to reach out to others and get some guidance.

I have never seen any rental property with keyless entry on the back patio door, but my tenant is asking for it.This is what I found out when I searched up TX requirement for rental properties-"Every rental unit in Texas should be equipped with the following security devices at the time that the tenant takes possession of the unit:One window latch on each exterior window in the dwelling;A doorknob lock or keyed deadbolt on each exterior door*;A keyless bolting device (i.e. a keyless deadbolt) on each exterior door**;A door viewer on each exterior door;A sliding door pin lock AND either a handle latch or a security bar on each exterior sliding glass door."

Those are filtering devices that only work in certain markets at certain times.People evaluated rentals and discovered a correlation between purchase price and rent rate to create a "rule" for quickly determining if a property is worth evaluating or whether it should be discarded.