the same problem exists when wanting to abandon a colony with a fort or fortress.
funny though would be, to implement a rule, that would leave certain buildings standing after abandoning a colony.
e.g. a fortress, fort or stockade remain after you abandon a colony (stockade for 15 years, fort 25 yrs, fortress 35 years) the number of turns would then calculated through that.
of course only...
2012-01-10 08:33:25 PST in FreeCol