Also, most of these leases are triple net which means tenant pays all expenses.

I use buildium which is a good value and I think the integration with tenant turner alone saves triple the hours needed to be worth the cost.

The 500k house is worth triple and that is besides for the net rents of 30k annually.

I want to try and double maybe triple my net worth and cashflow in next 10 years but do it on the conservative side not overleveraging property but by forcing appreciation by increasing margins and unit updates.   

When the property sells to an “outsider”, revaluation is brutal, doubling, tripling, or even quadrupling the tax valuation.   

Several years back I bought some properties that were more like 1.50% Out of The blue the property insurance tripled on them plus they were not A class properties.

I had gotten comfortable with triple net (NNN) properties and wanted to expand.

The price of the house has tripled. 

Also, can you clarify if this is triple net lease or not?

If you are looking to double or triple in size in a 3 to 5 year period you will have to do something that scales at a faster rate than what you have done for 20 years.