Acquiring renters with purchase

[Blake King]

Hello lovely Bigger Pockets community members! I am finally under contract with an awesome house hack duplex! After a year trying to buy north of Seattle we finally got something. 

Here is the problem. Closing is set for June 26th. The tenants lease is not up until August. The tenant has lived at the property for 3 years. They use a back garage / shed and pay $150 under market for rent. I need to raise the rent $150 and take back the garage. There is no move In check list, so I am afraid if I make them unhappy with all these changes and they decide to leave, they could trash the place and just say everything was like that before (when I toured the home they had already blamed some things on someone else).

Is this a valid fear? Any suggestions on what to do?

Thanks everyone!