I am looking for advice to purchase a security camera system for a small apartment complex.

Taking a picture of the receipt via camera phone works.I am taking a class next week on quickbooks, after that I will start being more organized with my expenses.It is good to understand the concepts of doing your own books.

Put in security cameras and good bolt locks. 

I have also only had one problem with noise and my neighbors were quick to let me know.I use an exterior camera system that I can tell if there is more people than what is allowed.I imagine there may be a wifi enabled sound meter/device that can alert you if sound is over a certain dB level, but have never had the need to look into this.I also get a copy of the renters drivers license so I know who I am renting to.I also have a minimum age requirement that helps weed out a younger group that might be more inclined to be single and throwing noisy parties.

I had a client in LA who installed special tracks on his ceiling for cameras so he could rent it out for porno shoots

Ring camera units are easy to mount most anywhere and relatively small.

I'm 29 years old, I live in Long Beach, California, and I work in the film industry here in Hollywood as a camera operator.

I've been doing a tiktok series that lots of people seem to like (getting 1m views on a video, on tiktok of all platforms, while being a balding middle aged man staring at a camera and talking about central bank rate policy, is not a small feat!)

Had a ton of people renting smoking and covering up the cameras.

I have a tenant trying to break his lease in terms of the security camera in plan visible site in common area/ kitchen living room,  was not disclosed on the lease.