There's a lot to unpack here... and it's not my goal to be a 'downer' on your aspiration... but just telling you my experiences to caution you about being new to the game...First - I don't think we know what state you live in, so just know that foreclosure auctions are handled very differently all across the country.  

I've always loved learning and there really is a whole lot to learn.

There is a lot to learn, but you already have experienced the beauty of REI with your ADU.

@Will Barnard I have a lot to say but want to keep this respectful. 

I forget the assembly bill that did not get passed that would in effect allowed each SFR lot to be like a R4 lot, allowing up to 4 units.  

It helped me a lot to ease the cleaning scheduling.

I've bought a total of 8 houses in my life, while I can't touch many on BP, that's a lot to me...mix of primary residences as live in flips, normal primary, and 4 investments.

The 50,000 would be a lot to pay for only three months use of the money. 

There's a lot to learn but its definitely doable :) I agree with the comments about Avery Carl's book as a starting place and would also listen to at least 50 hours of youtube and podcast content on the topic.Good luck! 

It seems like a dramatic failure to me. what I have seen is landlords in markets were houses actually sell for a lot to retail buyers they just sell them and take the rentals out of production..