Tenant's Lease is almost up...Send Notice of Non-Renewal ?

[Ryan K.]

I have a tenant who's lease is up in July. I intend on keeping the tenant, but under a totally new lease. (The prior lease was from the previous owner). Do I "need to" send my tenant a Notice of Non-Renewal? If so, why? Also, would anyone suggest getting certified mail with a return receipt? I've already told my tenant a new lease will becoming if they choose to stay. I need to know the best way to approach this situation, as it will be the first time I've one this. 

Thoughts? Suggestions?