Farmville has finally made buildings rotatable

Not all of the buildings are rotable, only some.  You can also buy an extra farmer's market stand, which means, you can only purchase up to six.  The old stands will not rotate so that means if you do want to rotate them you need to sell them and re-purchase new ones.

Not everything is rotatable, hopefully they will be soon, like the barns, nursery and horse stables are not rotatable but most of the homes are.