My opinion is that if either porch structure collapsed, it would wreck the house and hurt the foundation even more.The second biggest issue we have is half the walls and ceilings show sign of sagging because the plaster has come undone, this seems to be a pretty expensive fix, considering it's in both kitchens, and most bedrooms in both units.

When I did a drive by, I identified this total WRECK of an apartment complex was parked right behind 3 beautiful bay front homes worth around $1M each.

It is a train wreck.  

I don't know what to do; I am a total wreck.

It also includes maintenance (typically 10% of rent), property management (also about 10%), vacancy (you'll know better than me, but realize one moveout/unit/year and a month to get it re-rented is close to 10%), legal fees, advertising, occasional but large capital items like furnaces or roofs, evictions, repairs after a disgruntled tenant wrecks the place, and who know what oddball unexpected situation.

Losing people's money I truly cared about wrecked me.

OTOH the tenant in your half probably won't make you evict him, nor will he wreck the place.  

What I would do different: aside from starting younger, I would have bought a wreck, lived in it while I rehabbed it, moved into my van and sold the rehab, did it again until I had enough cash basis to ramp up my rental property buy & hold purchases.

Some are 20k not because they are a complete wreck, but because of the bad neighboring areas that keep people away from buying there.

This is very exciting, but nerve-wrecking at the same time.