How to give a notice to vacate to existing tenant

[Brett Riemensnider]

Hello everyone. I am purchasing a 4plex tomorrow and will be moving into one of the units. Every unit is currently occupied so I have chose the unit I want to move into and need to give a notice to vacate. 

They are currently on a month-to-month lease but would like to let them know asap to make the transition as easy as possible on them. I will be renewing July and will need to require them to be out before August 1st. 

Does anyone have a template I could use or advice on how to write up a letter to the current tenants more than just a notice to vacate? I think it would be nice to explain the situation a little bit and just apologize for the inconvenience etc. 

Any advice, or better a template to follow, would be extremely appreciated. Thanks!