Dear Sir,
I work in a company in a full time position. Iam on the 6th year of my H1. I got my I-140 approved in Jul 2009. When the PERM application was made i was working in Washington DC for the same company. The company closed the DC facility in January 2010 and moved me Boston. My job profile has not changed.

1) Do i have to reapply my PERM and the start the green card process all over again?
a. If yes, then is there anyway for the company to avoid this and file any kind of amendments instead.
b. If no, then what kind of notification to USCIS would suffice?

2) Will my priority date change?