@Omar PietersA few things here.The 1% rule is thankfully not a rule otherwise most real estate investments in the US and many other parts of the world wouldn't work.

Just make sure to look into the HOA’s financials, rules, and rental policies before buying.

Generally larger commercial properties and shopping centers are easier to classify with hard and fast rules, but to the points above the residential areas really move very quickly and have way more nuance than most people care to admit.zip codes are generally way too large for my liking at least in my market to provide any kind of insights other than macro level economics but even then highways or rivers that cut through a zip code can end up with totally different trade areas.we can get pretty granular with cellphone data and with grocery center data to understand the trade areas and their true boundaries, but that kind of data pull is generally only cost effective for investors doing larger scale projects or developments, and honestly we still just end up getting on the ground and feeling it out, so I generally tell people that the money is better spent on a plane ticket and weekend trip in the area you are looking rather than any kind of "trade area" level data studies.and generally B class in 1 area means something different than another. 

While BiggerPockets has very strict rules about (disguised) advertising in the forums, there's a whole classifieds section for that.Hope this helps!

Specifically; rules, regulations and permitting procedure.

Pete, try looking at cities within an hour of those areas.Lately, I’ve actually been seeing more properties hit the 1% rule, which hasn’t happened in a while.

I learned about the 75% rule from BP!

.: And how would you enforce that ruling Brian?

The 3x rule is just a rule of thumb.

Although I'm not ruling out doing another 1031 in the future to add a property or two.