Since you have experience with single family, you already understand the basic principles, but there are simply a lot more variables in multi-family, so it's not as easy to identify a good deal.

The property managers I've seen work on the principle that cash in hand is a sure thing and that all low income tenants will be destructive, at some point.

However, the basic principles have not changed since 2010/2012.Today, I am using QuickBooks Pro 2020 (desktop) and Windows 10. 

The point of retirement investing is preserve principle.   

It also means I can't use my own calculator to factor interst (or principle) paid (yes, I know they send you tax info but I put that info into my system based on what my calcs say I paid as part of my payments, as it should match what they report)If anyone knows the formal to use to type in this kind of loan (you can use the $3.2m example above and see if you can get something to say you should pay $20,355.58), please let me know.  

These are low or no interest, some have interest only payments with the principle due upon sale or even forgivable after 5 years. 

Read books, learn the market, drive around town and analyze trends.Always stay learning about real estate principles and your market.

All I have to contribute is if using the BRRRR principles you would need to look at AVR - 70% - Rehab and make your offer.  

The Dombroski Court stated “we continue to adhere to the principle that limited shareholder liability is the rule and piercing the corporate veil is the 'rare exception' that should only be 'applied in the case of fraud or certain other exceptional circumstances.'”

Act as the principle, but if they want to list it, you've already disclosed so list it.