I recently suffered an injury at work that will not allow me to return to my previous position.

Because you have nothing into it you would then have money for your next investment having achieved infinite return. 

Is $100 on a $100,000 cash outlay a good return?

It is a a huge time saver, but be sure to let the contractors know that any material that looks damaged be put to the side so you can return/exchange it.

I’m chasing him to return my investment as well!

Not a great cap rate, or cash on cash return.Depends on your goals, though - plenty of people out there are happy to park cash at a 5% return in a relatively safe property if it's turnkey.

Offer price is 75% of the realtor appraisal with 25% down, 5% interest on 30 year mortgage and assumes 5% vacancy, 10% property mgmt, 5%repairsSFH1 3B/2ba 1140 sq ft.Rent/mo 1500Prop tax 3384Insurance 1931Realtor appraisal $189240Offer price $141930COC return 6%Cash flow ~$185/moSFH2 4B/2.5ba 2200 sq ftRent/mo 2000Prop tax 4167Insurance 906Realtor appraisal $280000 Offer price $216700COC return 6%Cash flow ~$300/moCondo1 2B/.5Ba 1750 sq ftRent/mo 2625Prop tax 5335Insurance 3400HOA fee 8280Realtor appraisal $370000 Offer price $277500COC return -7%Cash flow $ -435/moCondo2 2B/2ba 1320 sq ftRent/mo 2300Prop tax 6363Insurance 520HOA fee 7800Realtor appraisal 450000 Offer price $315000COC return -9%Cash flow $ -653/mo1.

It's an inconvenience for the tenant and provides no return on your investment.

Rehab and that too of a property untouched since 1940 (which will be out of code for almost everything) is likely going to bring many surprises.If finances allow and numbers make sense then new build can get larger ($) returns.  

AS for owner occ homes or new construction.. folks buy those on need and emotion.. not on financial return calcs..