You also have to have a location within you home or a office period to get their service as the information is sensitive and they must know you are operating a business so make sure you have at least a llc. 

We keep a smaller footprint so we can give better service!  

I don't know if you're aware but this building is under rent control and the 2nd unit's $1,900 rent cannot be raised much and there are tight restrictions on removing the tenant.The type of buyers this property is perfect for are two separate parties (think friends or siblings) buying it as a TIC with each party occupying one unit.  

You then subtract what the estimated debt service would be - say $800.

After a months work to raise the rent, change the Home Owners Insurance company, get an Appraisal and maybe pay down a little on the mortgage to remove the Mortgage Insurance, I should be able to show up to $300 a month Net Rent.

The weather can play havoc on your property in cold winter areas.You need to make sure the property has been winterized by having the heating,water heater,pipes,rain gutters,and the like are serviced for winter and fully inspected.Make sure you have a snow removal plan in place like the tenant has to do it or you pay someone to do it on a regular basis.

Then I can fill a couple spots at the higher rent and in a year raise rents on everyone else. 

If you are thinking of becoming a part time agent to work with folks buying at "retail" price, you need to understand that they need your service and attention.

I treat it as an add on and I can raise rent with 30 days notice if they use more than the historic average.  

But I also noticed that appliance companies have services that can be called if there is an appliance needs to be repaired. instance, GE has a service where you call them and they arrange for a vendor to check out what is wrong and repair it.