I just looked online and saw that in Seattle for months to month lease the landlord is only required to give 20 day notice.

The only way to answer that in general (whether house hacking in today's market is still a good option) or for a particular property, is to learn how to run the numbers and analyze a specific property to see whether it will be able to stand on its own as an investment when you move out someday.There are a lot of resources here on BP for doing that but I'd just say, make sure the assumptions you're putting into your spreadsheet or deal analyzer are realistic.Make sure the rents (especially for vacant units or pro-forma #s) are realistic by doing your own rent comps; make sure the mortgage rate is realistic by doing some research online and/or talking to some mortgage folks; make sure insurance #s are realistic by getting a couple of quotes for the # of units and zip code / area you're looking in; etc.I hope that helps, and good luck 😊

You can create your own, or there are house flipping spreadsheet templates available online 

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Search for this in a Michigan Public Notice legal newspaper or an online legal notice aggregator site like USALEGALNOTICES and the fount of MI pre FC/FC data will be available to you.

When I did an online search for commercial multifamily lenders, most have a minimum lending requirement of $1M and I don't need that much. 

The amount of ideologically inspired nonsense online is mind-boggling. 

In my experience, most of the online calculators are just taking an educated guess for you.

Take a close look at what other similar units look like on Zillow or other online listing sites and try and mimic them or exceed them.

check the local municipal code, most are online.