Perhaps your #6 of repurposing commercial in to multiple small residential units is the best idea I can see in SA as it has had way too many Single Family rental homes added the last few years. 

You can use bat insulation or spray foam, which has the added benefit of giving you an air-tight seal and also keeps the bugs out. 

One effective strategy to maximize unit potential is to explore opportunities for adding extra units, especially in C-Class properties.

He's done everything on my list but adding the bathroom in my basement.

I'm planning to send some mailers this year using the Ballpoint Marketing integration, so really glad to see you guys have added that!

However, with smaller investments, if bonus depreciation isn’t captured in the first year, a cost segregation study’s cost may outweigh the added benefit.Additionally small tenant improvements could have similar benefits with bonus depreciation and new assets.

If OP has not already tried calling every we buy houses ad in the area, they should also do that. 3 days is very limiting though - no time to waste. 

For me, adding value is table stakes (and that helps with scalability).

Baselane has the added advantage of synching with your Schedule E you'll use at tax time to file your taxes.

Keep adding more.