Lego Assembly Square: 10 Things You Should Know

10255 Assembly Square is a LEGO set in the Modular Buildings, a sub-theme of the LEGO Creator theme introduced in 2007, which features large, detailed, connectible buildings primarily aimed at older teenage and adult fans of LEGO.

Most LEGO sets in the Modular Buildings series contain more than 2,000 pieces and make use of unusual building techniques not usually used in previous LEGO sets.

The Assembly Square 10255 is the twelfth set in the Modular Building series, released on January 1, 2017.

The set is the biggest of all LEGO sets in the Modular theme containing more pieces than any previous Modular set at 4,002 pieces as well as the most Minifigures with nine Minifigs including an infant figure (a dentist, barista, baker, florist, music store assistant, dancer, photographer, and a LEGO fan, plus a baby figure).

Assembly Square 10255 Features

The Assembly Square Marked the tenth anniversary of the Modular Buildings sets and contains numerous easter egg references in the use of brick elements, architectural details, and colors used in Modular sets over the previous years.

Assembly Square 10255 features a wealth of unsurpassed details, intricate details, and hidden surprises, and comes with easy-to-remove building sections that provide access to a highly detailed interior.

The interior of Assembly Square 10255  comprises of ground level with a bakery, florist’s shop, and a cafe.

The middle level features a music store with a buildable drumset, two guitars, and saxophone element; a photo studio with a buildable classic camera and adjustable tripod; and a dental office with a buildable reclining chair, waiting area, telephone, and a sink.

The upper level features a dance studio with buildable piano and reflective mirror, an apartment with a buildable foldout sofa bed, detailed kitchen, toilet, micro LEGO train, modular buildings and Eiffel Tower, and access to a rooftop terrace with a buildable barbecue, table, and a neglected plant.

The exterior features a detailed sidewalk with outdoor cafe furniture, a fountain, streetlamps, and a highly elaborate facade with beautifully detailed doors and windows, three buildable shop signs, a spired tower, and a decorative roofline.

The Assembly Square 10255 includes 4,002 pieces and eight Minifigures including a dentist, a barista, a baker, a florist, a music store assistant, a photographer, a dancer, and a LEGO fan, plus a baby figure.

What Is LEGO Assembly Square Based On?

LEGO Assembly Square is based on The Assembly Square, a neighborhood in Somerville, Massachusetts.

The Assembly Square is home to the Assembly Row, a 45-acre (180,000 m2) mixed-use, and includes retail outlets, restaurants, residential space, office and research and development space, a 12-screen cinema, and a 200-room hotel.

It also includes other amenities including a marina, a revitalized waterfront park, bike paths, and other green spaces.

When Did LEGO Assembly Square Come Out?

The LEGO Assembly Square 10255 was released on January 1, 2017.

How Much Is the LEGO Assembly Square?

The LEGO Assembly Square 10255 costs $299.99.

Is LEGO Assembly Square Retired?

No, the LEGO Assembly Square 10255 is not retired and is available on the LEGO website, Amazon, and other places that sell LEGO sets.

When Will Lego Assembly Square Retire?

The Assembly Square 10255 is estimated to retire in 2022, but this is just an estimate and there is no official announcement regarding its retirement.

How Long Does the LEGO Assembly Square to Build?

The Assembly Square takes around 9 to 12 hours to build. The set comes with six numbered bags and each takes about 1½ to 2 hours to build, with a total building time of about nine to twelve hours.

What Is Lego Assembly Square Based On?

How Much Does LEGO Assembly Square Weigh?

Assembly Square weighs 10.45 pounds and measures over 13” (35cm) high, 14” (38cm) wide, and 9” (25cm) deep.

How Many Bags Are in LEGO Assembly Square?

The Assembly Square contains 34 34 bags divided into six numbered bags.

How Tall Is LEGO Assembly Square?

The Assembly Square is 13inches (35cm) high.

How Long Does the Lego Assembly Square to Build?

Final Thoughts

The Assembly is the largest LEGO set in the Modular Series and includes 4,002 and eight Minifigures, plus a baby figure.

This is a hard-to-find LEGO set and currently retails at $299.99, available on the LEGO website, Amazon, and other marketplaces that sell LEGO sets. 

The set is cool, fun, enjoyable to build, will make a great display, and is aimed toward older teenagers and adult fans of LEGO (AFOLs).

The retirement date for the set is not yet announced but it’s estimated to retire in 2022 so it’s a good idea to grab the site now before it retires and considering that it’s a hard-to-find set and is likely to increase in value after it’s retired.

Lisa D. Marsh

Hi, my name is Lisa and I'm the editor of BrickMechanics.com LEGO has been part of my life ever since I was young. I have a deep love of LEGO and it has guided me through my early years, through school, and eventually through my degree in Engineering.