That could mean fewer lending regulations overall, which would be amazing.

There isn't a sustainability problem in Texas, it's a regulation problem.

BUT even then, the contract is valid, it just violated Portland regulations and the owner would owe the tenant the local Relocation Fee (penalty, which is steep). 

Every property is so different and the various codes and regulations are different as well.

Quote from @Fernando NA: Hello everyone,I’m considering purchasing a piece of land near Divide, CO, to build a small off-grid log cabin and list it on Airbnb or similar platforms.For those of you who live in the area or have experience with this, I have a few questions:>Is it possible to list such a property on Airbnb given the local regulations?

Yeah, it is based on the state's regulators.

I'm looking to buy a house in the St Pete market & have read zoning regulations, articles about STR (anything less than 30 days) and have discussed with my realtor.  

There good ways to navigate the market between the 5 counties, 2 states and many different HOA regulations.

As for Alexandria specifically in terms of regulations don't take advice from a public forum - look up the laws yourself and make sure you understand them.

I’m not sure all of the regulations/rules to this in PA though.