We are in talks now with a sprinkler company to get a 13D sprinkler system and alarm system installed.

The property also needs Foundation drip zone installation.

Not something you should DIY with just input from the internet. 

The original lease from the owner who owned it at the time it was installed had hand writing on it for payments that increased per 5 year term is what it looked like if I recall correctly.

I got a couple quotes to install 4 smoke detectors - $1200 and $750.

However, installation costs and procedures may vary, so it's worth getting quotes from both if you're not doing the work yourself.As a hard money lender specializing in fix and flip deals, I've seen successful investors use a mix of these sources to optimize their budgets while maintaining quality.

Durable and waterproof, easy to install, and has enough options that you'll be able to find one that goes well with the finishes in the house. 

DIY managing is usually best, so you learn enough to avoid getting taken advantage of if/when you hire a PMC in the future.Your challenge is learning enough to avoid lawsuits and costly mistakes!

You don't want to DIY something like this, especially with the covid eviction moratorium. 

I think new cabinets would be around 3000 fully installed.