But it's completely unnecessary and just causes alarm sometimes with the sellers.

Due to fire alarm test failure by the fire department, seller asked that I close on the last week of March as he needs time for his electrician to correct the issue.For multifamily, I hate the idea of closing at the end of the month.

I would just add that there are some that will also send an alarm to your smart phone. 

You can have an alarm system, but if the tenants turn of power, before you get the house back, it doesn't do you any good.

I have alarm bells going off in my head and I just want you to be aware that I think you should take a couple steps back and look REALLY hard at this deal.Best of luck!

Also how should I handle/document this incident of her removing a smoke and CO² alarms?

Unfortunately, I'm a college student for the next year which seems alarmingly useless since I'm a full time investor and do not plan on changing that once I graduate.

And, if you're concerned, using and alarm system, and or cameras would likely make you feel a bit more comfortable.

That to me is as alarming as the GF.

Ignoring the obviously crappy quality of the product, I had some quite alarming (and not unfamiliar) conversations with AC repair companies.