My friend said his client nearly bailed when she found unexpected wiring issues behind the kitchen walls..apparantly the seller hadn’t touched that electrical since the Reagan era..but with a patient electrician who understood the local code and a carpenter who improvised a shelving trick in the diningrom, they ended up selling above asking.Flipping and building can get tricky, especially once you start thinking bigger.

I could also argue that building costs and building codes change over time.

We had enough rich friends hear what we were doing; it felt like we cracked a code - a vacation property that made money.

If you would like a referral code or more information please let me know.

How did you decide which neighborhood/street/zip code to start with?

Ten years ago, there was almost zero code enforcement so you have a bunch of nonsense that you may not catch with pre-existing stuff and you may get hit with some monster issues down the road. 

Consider having a lock that can be easily rekeyed or a pin code enabled lock such that you can easily change things, especially after a drama filled hissy fit where one tenant suddenly leaves out of anger/frustration.8.

It will provide you with zip code level of market rents, rental demands per metro markets.

They wanted upgrades to electrical panel that was upgraded in 2009 to current code  (arc fault breakers) they said they would walk , I said good bye . 

Then I helped friends or people who I was recommended to with basic remodel suggestions while staying up to code.