I may even Uber it up for some extra income.

Goldman is just about half way in paying back the fines so they will most likely be still doing their massive buy/hold/forgive debt to earn the credits needed to forgive most of the remaining fine balance.

Building 3 is a conventional loan, I earned the 25% down for it with bitcoin :-D So I'm all about doing what I can to make this happen. 

Many first time buyers out there do not have the extra cash to remodel which is why they prefer a turnkey project. 

you earn your money for sure.

Is 20% down a good plan or should I do less and use the extra money for updates to the house?

The units come pre-loaded with freon so dont let anyone charge you extra for that.

Oftentimes the seller will base the price on current rents and depending how far below market they are you can get a unit that is renting for $1100 that should be renting for $2000 to live in by paying the extra $15,000-$20,000 in relocation assistance, which if you treat it like an increase in purchase price is a pretty good deal. 

If so, is the extra $400 worth your time?

It's a 3 unit 129k with a new roof, new windows, new flooring, My mortgage will be roughly 1200/month, if I can rent the other two units for 1200/month, then I live for free and have an extra +/-$1200/month to put away every month as well as the income from my full time job, even at 100% vacancy, my mortgage is lower than buying a single family home and also lower than renting.