Selling Rental Property: How to Keep Current Tenants Happy?

[Chloe Dawn Murphy]

I've decided it's time to sell one of my rental properties. I'm excited about it's earning potential of 50-70k. It is currently filled with 4 female college students all with separate contracts that all end around August this summer. 

What do I need to do to help them feel taken care of during the transition of owners? 

I want to sell in 2-3 months. What are the legalities to selling before their contracts are up?

I want to keep them renting as long as possible, how should I communicate to the tenants throughout the selling process in order to do so?

Thank you for your help!