When we buy primary we do not pay mortgage for 2 months, is that applicable to investment property?

I actually had to get enough units where I could offer tenants multiple housing options when I purchased properties rented at way under market rates and then (an embarassing number of times) personally watch tenants that would "suffer" from a rent increase turn down smaller (but nicer places) or  nicer places in a less prestigious zip code (sometimes only minutes away) before I realized that I was hampering my ability to earn a living in order to subsidize the lifestyle choices made by a some random stranger that happened to live in a property I bought.

So, a simple rule of thumb would not account for the wide variability in what it might cost.

They each signed a 9-month lease at our existing midterm rental rates.

Mortgage.

Mortgage.

Mortgage.

This is why you must evaluate properties not strictly off intrinsic #s like people did in low rate era.

Hello,I live in a pretty hot market, with very low vacancy rates and high property demand. 

Current interest rates are a factor that we are taking into consideration but if a deal makes sense with the current interest rates, we don't have a problem reinvesting.