You file Articles of Formation with the state, get a Federal EIN and a bank account. 

The second bill requires landlords to provide financial relocation assistance to tenants who vacate their homes due to rent hikes and qualify for the assistance. https://www.king5.com/article/...

If you’re interested in using an LLC, this article also further explains the advantages of a Series.The fourth pillar is somewhat similar - you want to separate your operations from your assets.

You should have a system in place when investing out-of-state, I recommend that you read this article about your Core 4 to real estate investing.

Here is a helpful article I read on BP:https://www.biggerpockets.com/...Hope this helps!

Articles of Organization (depending on the entity you choose), Statement of Authority, Operating Agreement (can be optional), Employer Identification Number (EIN).

Converting apartment buildings  (made up of 300-600 sq ft units) that have lots of character and close to downtown to condos was very popular in the boom times (pre 2008). 

Regardless, it'll be vital to build your core-4 if you plan to invest out of state, I'd recommend reading this article by David Greene: https://www.biggerpockets.com/blog/core-four-real-estate-tea... 

Creative financing usually becomes popular when either 1) interest rates rise or 2) the credit market freezes.So seller financing became really popular in the 70s and early 80s because interest rates had skyrocketed.

Study up by reading through articles, forums, podcasts, and manuals to get the most out of your real estate investment experience.