Lease extensions are pretty normal actually, its even one of the options offered by BMW FS as part of their lease end package. Call your dealer or BMW FS directly, they`ll hook you up.
Current: 2015 Porsche 911 Carrera GTS Sapphire Blue / Black Leather + Alcantara Interior
Past: 2013 Mercedes C63 AMG Sedan Magnetite Black / designo Porcelain/Black Leather
RIP: 2011 BMW M3 Sedan Alpine White / Fox Red Novillo Leather
Past: 2008 BMW M3 Sedan Melbourne Red / Black Novillo Leather