Maybe I missed it, Bill B kind of eluded it but why not do seller financing? 

We moved a couple of people in by the room and had our bills, mortgage paid for and even our grocery bill.

Have I made a terrible mathematical error?

They will be able to hold it for up to 180 days to give you time to sell your old property.The complications with reverse exchanges and lending is exactly what Bill asked. 

In each category, note how much you are bothered or stressed on a 1 to 5 scale, with 1 = not bothered at all and 5 = stressed out: Pain Points Stress1 to 5 Pain Points Stress1 to 5 Unit turnover Exterior maintenance Advertising for available units Deferred capital expenditures Tenant screening rules Plumbing or electrical emergencies Tenant selection / discrimination rules Mortgage payments Documenting move-in conditions Bookkeeping and bill paying Documenting ongoing conditions Taxes and insurance premiums Dealing with tenant complaints Risk of late payments or non-payments Dealing with neighbor complaints Risk of property damage or vandalism Mold, termites and rodents Premises liability Interior maintenance Evicting tenants If your completed table has mostly 1s and 2s, then congratulations—you are a happy landlord!

I’m billed quarterly in Las Vegas.

I ultimately obtained a variance to build 12 townhomes and 18 condos reliant on my hardship case and by agreeing to take responsibility for replacing the retaining wall in a re-designed terrace approach that stepped the wall back from the most immediate neighbors which was a rounding error once applied to the overall project budget.

I have minimal plumbing experience and thought it would cost me way more than what the actual bill was.

Right now, I'm buying T-bills and bond index funds. 

I will just have my bookkeeper bill a flat amount monthly from Jan 1st on.