I am a landlord and I just bought a new rental property, do I need to give a notice to the tenants that the rent will be increased

This question is a bit more complex than it might initially appear because you are talking about giving the Tenant a new lease and also talking about raising the rent.  To be sure your rent increase is effective you must first determine if there are any rent control regulations in the municipality in which the rental property is located, and of course comply with those limitations, if they exist. You should send a separate notice via regular and certified mail advising the Tenant that the rent will be increased to $XXX effective on such and such a date.  If you haven't sent a notice yet and if the rent is due on the 1st of each month, then the rent increase cannot take effect until October 1, 2016, assuming the notice is received by the Tenant before September 1, 2016. Sending a separate notice is important becuase if the Tenant fails to sign the new Lease the rent incrase will not be in force unless you've sent a separate notice advising the Tenant of same or unless you've incorporated the notice into the cover letter by which the new lease was sent to the Tenant.