60 not 15!
DMCJ . . .
The type of lease that you had and which expired in May of 2014 is called Tenancy for Years. When such a lease expires by its own terms and the tenant remains at the property, he becomes a Holdover Tenant in a Tenancy at Sufferance situation and may even legally be a trespasser until the landlord acts to eject him.
Some jurisdictions impose an irrevocable election whereby the landlord treats the holdover tenant as either a trespasser or a tenant at sufferance. While the first option is obvious and self-explanatory in nature, quality and result, the election of the latter option creates a month-to-month (periodic tenancy) tenancy which is what you have now.
The termination of a month-to-month tenancy requires a 30-Day notice from either side if tenancy has been for less than 1 year, or a 60-Day notice if tenancy has been for over a year. So, if you want to terminate the tenancy and vacate the property, then you HAVE TO give your landlord a proper 60 day notice.
fredrikklaw