Increasing Rents Currently Below Market

[Edgar Z Whelan]

I have multiple rental properties way below market rents.  Some perhaps 30% to 50% below.

Since I do not have any mortgages I have ignored raising the rents for years. 

So my question is how to raise the rents to market prices? All at once or in increments? Suggestions ?

They are all m2m. And they all pay on time. Never have any turnover.