Put a water alarm in the kitchen sink cabinet to warn of leaks from plumbing there. 

It will contain any potential leaks from a sink drain, dishwasher or fridge.

I am looking for contractor referrals in the Seattle Tacoma area who are available now, reliable.1) Flip is about 50-60K and 2) B class rental makeover 20-25KWould prefer licensed and bonded GCs to run projects, especially the larger project, but I can GC if needed.Trades I'm looking:GC to handle mostPlumbing (repairs and move a sink drain 7 feet on same wall)Carpenter (fix & install doors, trim, rebuild deck)Window installer (can install and trim)Electrician to make some repairs on wiringI have painter, flooring, roofing, kitchen/bath cabinets coveredThank you!

By the time I realized just how bad they were, I ended up having to sink 70k into it doing repairs they said they did and more from the neglect. 

Dealing with receipts is my biggest time-sink!

Get a permit for a bathroom and a utility sink, and put in an egress window for your new pottery studio. 10k vs 200k for a legal ADU.

The possibilities for finishing a kitchen are immense—you’ve got cabinets, counters, backsplash, sink, flooring and appliances to worry about.

Mistake #10 just happened AGAIN.The extent of my plumbing knowledge was to look under the sinks and turn the valves in hopes it just wasn’t opened all the way.

It was a foreclosure rural & inside it was tough to breath.We counted 70 dead bats in various rooms & in the bathtubs/sinks/toilets & I couldn't imagine the piles in the attic.

I say this not to discourage you from entering the industry, but managing 100 units with no prior experience would be a difficult sink or swim scenario, in my opinion.