Florence galleria for investment

I got a call from a representative of florence galleria. According to him, a person can buy 100 sq/ft area on its harley floor for 18 lac (lump sum). Interestingly , the user will get guaranteed 22-26% percent after 1 year. That means 18 lac will be 22 lac approx after 1 year. What you guys advice. Regards

Nothing is ever really guaranteed, sir. But I would still be interested in knowing more about it.

Also if experts can shed light on previous track record of the developer.