Questions regarding tenants going month-to-month at end of lease

[Mano Chidambaram]

Hi Folks

One of my tenants has a lease ending 11/30/17. He is looking at buying a house and has inquired about whether I would be interested in selling the property. If not, he has another property in mind and was wondering if he could go month to month after lease end for 1 to 3 months

I am not planning to sell the house but had a couple of questions:

1. Are there things that folks have done to entice renters to stay longer?
2. Do you typically charge higher rent for month-to-month and if so, what percent higher?
3. Any other concerns of allowing him to go month-to-month vs. just getting another tenant on a year lease?

Thanks in advance for any feedback.

Mano