Is the FLATIRON-1 set still considered a rare collectible?

Yes, as a 2014 LEGO Brand Store item with only 15 pieces, it holds niche collectible value.

What is the theme of the FLATIRON-1 set?

The theme for this set is the LEGO Brand Store.

The set, FLATIRON-1, contains exactly 15 pieces.

Name: LEGO The Lego Store Flatiron District Grand Opening (FLATIRON-1)
Brand: LEGO

LEGO Brand Store

LEGO Brand Store · 2014

Theme · LEGO Brand StorePieces · 15Set Number · FLATIRON-1Year · 2014

Used

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New / Sealed

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Is the FLATIRON-1 set still considered a rare collectible?: Yes, as a 2014 LEGO Brand Store item with only 15 pieces, it holds niche collectible value.
What is the theme of the FLATIRON-1 set?: The theme for this set is the LEGO Brand Store.
How many pieces are included in the LEGO Flatiron District?: The set, FLATIRON-1, contains exactly 15 pieces.