1) one (1) year + one (1) year [optional] is the norm currently being practiced in the market and you can depart from the norm and imposes either two (2) or three (3) years on the principal period and with an option of either one (1), two (2) or three (3) but never three (3) simply because any period more than three (3) years continuously amounts to a lease, you don't want to lease your property.