Statutory Notice Period for Rental Retail Space

Questioner

I have been renting a retail space for 15.5 years. (September 1999) Renewed tacitly every time for 5 years. Now the 3rd term has recently expired (September 2014) My question is, what is my legal notice period? Can I stop in September 2015 (financially no longer possible)? I look forward to hearing from you.

Lawyer

Has an extension clause been agreed upon for two times ten years? The latter could be converted into a lease term of one year within which you can also terminate. (conversion)