It was offered to a relative of mine as payment for services rendered, meaning we risk losing nothing here.

Owner said has long term tenant on one side of 9 years , building has had  great rental history.  600*2=1200 monthly1200*12= 14400 yearly taxes/insurance =2800 yearlyrepairs/maintenance 10%= 1440vacancy 10%=1440 14400-2800-1440-1440=8720 NOI20% down on 99000 @ 4% interest 30 years =19980 mortgage payment roughly 382 a month /382*12= 4584(NOI )8720 - (debt service )4584= 4136 monthly cash flowcash flow 4136 / (money invested) 19980 =20% ROIAm i missing anything here ?

Not jewelry, Computers, Guns, iPhone's, Dental Services, ….. just shipping and paper services.Now, one half of the building will be empty in about 40 days, so there will be a totally empty 1000 sq. ft. very nice open room / office available.

You can choose to flip a home, build a bigger reserve and decide to BRRRR.

I’ve signed with a Property Management company with realty services.

Then save up your reserves for future deals.

They did not reply for 5 additional days and when they did, they demanded full rent payment and sent us receipts for the appliances they bought and the cleaning services they used prior to us moving in. 

Don't forget that you need cash  reserves and closing costs in addition to the down payment. 

I was wondering if you use any tools/services to manage your fix and flip projects?

I say this because with 20k your options are fairly limited and you need adequate cash reserves to properly do REI.