An employee of my tenant would leave the front door unlocked when she goes down the street for snacks.

I am having trouble unlocking 200k or equity in my primary residence.

I think you can go more affordable with a wyze camera(s) and a coded lock where you can have unique codes to unlock the door.

However, I'm receiving such a wide variance in prices (from $500,000 - $1,500,000) and it's hard to know where to spend money to unlock the true value of this property.

A refinance would unlock the cash. 

The manager would unlock (from their phone) for the cleaners and the arrival of the guest.

There are so many more perks that are unlocked when you BRRRR instead of flip.

I do it if it is left unlocked, I'm a Realtor in NJ but also buy in NY & PA where I'm not licensed or have access to their lock boxes.

I'm interested in trying that however, I always wonder what happens if they leave a door unlocked or what if they damage property while inside the house without someone with them?

This will cover 99% of propect work schedules4) Self-Showings - easiest, but potential security problems - suggest using Ring or Simply Safe type systems to monitor comings/goings and that they locked doors on exit and didn't leave a window unlocked for later burglary.