Is this set rare because it was a grand opening exclusive?

Yes, this set was an exclusive commemorative piece celebrating the LEGO Store Grand Opening in 2008.

How many pieces does the BRAINTREE-1 set contain?

The LEGO Store Grand Opening set, BRAINTREE-1, contains 58 pieces.

This specific set is part of the LEGO Brand Store theme.

Name: LEGO LEGO Store Grand Opening Exclusive Commemorative Set, South Shore Plaza, Braintree, MA (BRAINTREE-1)
Brand: LEGO

LEGO Brand Store

LEGO Brand Store · 2008

Theme · LEGO Brand StorePieces · 58Set Number · BRAINTREE-1Year · 2008

Used

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New / Sealed

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Is this set rare because it was a grand opening exclusive?: Yes, this set was an exclusive commemorative piece celebrating the LEGO Store Grand Opening in 2008.
How many pieces does the BRAINTREE-1 set contain?: The LEGO Store Grand Opening set, BRAINTREE-1, contains 58 pieces.
What theme does this commemorative set belong to?: This specific set is part of the LEGO Brand Store theme.