@Nancy ZhaoWhile heat-pumps (either air to air or air to water) are wonderful  - we use them quite extensively - those of us in climates which experience *real* winter are normally required to have an ancillary source of heat to cover those periods where the heat pump alone is inadequate.  

I'll be cash flowing enough to replace my income in about a year(or at the very least enough to cover my burn), and I want to 'retire' and go full time investing/flipping/hustling side businesses.

The guy shovels snow because snow removal is not covered in the lease and he doesn't want to trudge through snow to get into his house.

If they have to pay an agent to sell this property and the buyer agent as well then the $15,000 margin might not even be enough to cover that (4% commission is $17,000).

My personal formula for critical mass is: My lifestyle overhead (variable for everyone) + 1 SFH deal per month = Critical MassThis basically means, if I can cover all my expenses and planned expenses in life & have the OPTION to buy 1 SFH home per month, I would consider that critical mass for myself.What is your personal formula?

And I would rather have more doors, so if my one tenant moves out there are others to cover the bills.   

HOA covers all outdoor maintenance (roof, yard, siding, trash) HVAC was replaced in the last 5 years.

Make sure numbers work and rainy days are covered.

There are classes on private lending and pm me for a free private lending checklist that will hopefully tell you if you have a lot of the private lending bases covered.

When we had performed a walk-through of the property, the tenants had covered all the smoke detectors to smoke pot in the house. #2: we like that unit the best and plan to live there for a long time. #3: we like the other tenants and want to keep them.