Laws and regulations tend to be better here than most markets.

other than the state of Oregon were you do need a developers license I have one.. to get one you need insurance and a bond .. so that does take decent credit to get.but other than that.. like you said its wide open.. and usually it somewhat self regulates as lenders these days vette the operators or should be.. but people do slip by I know its happened to me.. and pretty much every HML will have defaults and foreclosures. you just don't want to be on the butt end of it.Also I am a NMLS registered mortgage banker.. now to get a state RMLO which you need to register on NMLS you do need an FBI background and finger prints.. does not mean you will get denied but you can.On the real estate broker side you usually just have to fill out a form and you know how many fib on forms..

Every state has regulations that outline how to put an abandoned vehicle in your name.

The best place to start is by googling what that areas regulations are for 3 family properties.

And that’s not even getting into the details of what happens if you have LLCs in multiple states, each with different legal regulations and tax obligations.

In some areas, rents increases are limited by local regulations.

@Matthew Meade look into the laws for short term rentals and taxation before you start up rules, regulations and taxation vary greatly from city to city

That is regulated by the SEC and the CA regulator. 

BUT I would guess if you don’t have a license there’s no one who’s regulating how you screen your tenants and you have free reign.

ESA are not considered petsif the ducting was free of pet dander at move in, charging for the duct cleaning due to the ESA is a legitimate cost of the ESA and is allowed to be passed on to the renter.Consider using a pet screening service such as www.PetScreening.com (no affiliation), it can discourage some unscrupulous tenants with ESAs.My view is HUD should change their current regulations regarding ESA to reduce the abuse.