So as long as your insurance, property taxes, property management, utilities maintenance, repairs, vacancy, and capex come to $4/mo or less you’ll be fine.

However, if you want to flip you may be able to make irregular chunks of income quicker that can make up the difference.Which leads me to the utilization of your equity.

Since your friend covers utilities, this offsets some of your cost.

It depends on the number of Units, Residential or Commercial, Apartment Complex or mix of Single Family and Multifamily.Under 25 unit - Tenant Cloud, Rentech.Under 100 - Then Doorloop/Buildium.100+ - AppFolio, Yardi, Rent Manager.Apartment Management : Yardi seems to be wildly usedSingle Family ( Mixed ) - AppFolio seems to be popularRent manager has a good customer support team.

You find the house completely trashed with missing appliances and cabinets, tenants were cooking meth, windows broken, etc. 6-8 months of unpaid rent, unpaid utilities, thousands to empty the abandoned property and trash, $50,000 to completely renovate the property and make it rentable again, plus all the time, energy, and stress along the way.I would actually argue this is pretty common and not even the worst-case scenario. 

The property cash flows at a 15% ROI…………………..before insurance, debt service, utilities, management, vacancies, repairs, maintenance, payroll and property taxes7.

Now for my out-of-pocket expenses:Down payment: $7500 (Hard money loan 90% purchase price 100% rehab)Closing costs: $6500Inspection: $400Agent's commission: $5200 (didn't raise purchase price of house with seller concessions, so that money didn't apply to the commission sadly. won't make this mistake again)Holding costs: $1300 (one interest-only payment of $770, roughly $200 in utilities and $360 in insurance)Total: roughly 21 grand. 

Maybe they work for the fiber company and they want to put some kind of utility hub there.   

There are a ton of CRMs out there but we use Zoho for its ease of customization and integrations.2.)

More specific: He stole months of rent and utility payments from a tenant (and threatened to evict her!)