Need help!! Residential or Commercial

[Jack Justice]

This question may have a very simple answer but I am very new to this so I figured the more help I could get the better!

I currently have three residential homes that I have worked very hard to pay off. Total value is $250,000. They collectively bring in $2200/month.

My question is should I sell them and use the money for a down payment on a large commercial property like apartments or keep them and get a loan using the properties equity and just hang on to them?

Any help would be great and very sorry if I am asking this in the wrong section, doing it off my phone and this is my first post.