Since you are a pro, use the calculators provided under tools to help but here is my quick rundown on a post-it:Buy = $80kRehab = $30kHML Points = $3kHML Interest = $3k (assuming 90 days held total)Holding Costs = $1,500 (assuming 90 days electric, gas, water/trash/sewer, builders risk ins, prop tax)*Selling Costs = $10k (6% relator fees, 1.5% closing costs)Sale Price = $135kProfit = $7,500*I am taking a very high level guess on your holding costsFor me this is WAY too thin of a margin.

Also keep an eye out for evidence of any lease violation.... unauthorized occupants, unauthorized animals, tampered smoke alarms, damages, etc.In addition to checking all of the smoke alarm devices, plumbing fixtures, electrical fixtures, appliances, and operation of doors and windows, ask the tenant if there's anything that's not working or needs attention.

Planning on doing a massive plumbing, electrical, and remodeling job for a 2 story mixed use building my family owns.

Finish quality, Large system replacement (eg. roof or electrical) can all muddy the numbers. 

For simplicity’s sake, I am considering rolling the utilities (water, gas, electric, internet/cable) into the rent.

Hey All - still a newbie here.I own a 5-acre plot of land that has 3 electrical and waste hookups plus a house on the property.

I am considering a electric cooktop vs a standard full stove with oven.  

It was built in the 50's and the owner pays water, gas, electric for the property.

What kind of shape are systems, plumbing, electric, windows?

We had to do all new plumbing and electrical throughout the entire property as well.