I would email and certify mail with signature required. 

The letter is computer generated from a company out of state, there is no signature on it.

You can view the blog by going to my website link in my BP signature below.I also stated a BP blog last week and should post each week.BP blog at   MANAGING YOUR TENANTS BY MAIL........KEEP YOUR SANITYGood luck.Fixer Jay DeCima

Thus:Landlord and Tenants agree to the following changes and/or additions to the Agreement:Effective April 1st, 2016, rent will be increased from $1695 per month to $1779 per month.Landlord signature: _________________________________ Date: __________________This notice was served by the landlord by personal delivery to the tenants on 2/17/2016.Notice to inherited tenants after acquiring new rental property:Notice of Change in Terms of TenancyThis is an Amendment to the rental agreement dated February 21, 2016 (“the Agreement”) between [your name] (“Landlord” or “We”) and [tenants' names] (“Tenants” or “you”) regarding the property located at [address] (“the Premises”).As you may know, your rent has been far below market rate for the past 4 years, without any increases during that time.

Just because you put the provision in writing (and have a tenant's signature agreeing to it) doesn't make it enforceable in Court.

There is no need for signature and it's immediate.  

Ask the seller for paperwork (like the move-in checklist for the tenants) copies of leases, proof of disclosures (like the lead paint disclosure/signature acknowledging receipt of the epa booklet, etc)  Make sure the tenant deposit(s) are transferred to you.

Thankfully we have pictures and their signatures on documents to prove this.

I don't understand how you ran a credit/background/etc check on him without getting his signature on the application.

I charge an extra 1/2 month's rent in refundable security deposit, required renter's liability policy, pet interview, AKC Good Citizen Certificate (waived if great pet interview), vet records showing breed, age (no puppies) and current rabies, required current city pet license, signature clause stating pet has never been aggressive, and 2-year lease term (this way they have to live with their pet damage for a while if it happens, but if it's a serious violation, I still have remedies.)