Is this LEGO set rare because it is promotional?

Yes, as a Promotional set from 2015, it has specific collectible appeal beyond standard releases.

How many pieces does the Washington Monument set have?

The LEGO Washington Monument (WASHINGTONMONUMENT-1) set contains 36 pieces.

This set was released in the year 2015.

Name: LEGO Washington Monument (WASHINGTONMONUMENT-1)
Brand: LEGO

Promotional

Promotional · 2015

Theme · PromotionalPieces · 36Set Number · WASHINGTONMONUMENT-1Year · 2015

Used

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New / Sealed

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Is this LEGO set rare because it is promotional?: Yes, as a Promotional set from 2015, it has specific collectible appeal beyond standard releases.
How many pieces does the Washington Monument set have?: The LEGO Washington Monument (WASHINGTONMONUMENT-1) set contains 36 pieces.
What year was this specific LEGO set released?: This set was released in the year 2015.