42XX — Marina Del Rey, CA

Mass Timber Merges Work and Leisure in SoCal

CLT Mass Timber Construction in Marina del Rey Los Angeles by the Pacific Ocean
200,000 SF
House & Robertson
Morley Builders
The Bradmore Group
Mass Timber Manufacturer
SmartLam North America
LABC Architectural Award - Under Construction
Westside Urban Forum - Merit (Office)

42XX brings three mass timber creative office buildings to the seaside community of Marina del Rey in Southern California. The project team successfully installed all mass timber elements within three months. Perks include a ground-floor cafe, ample landscaping, third-floor decks interconnected by elevated walkways, at-grade parking with stackers, and generous bike storage. Anticipating future trends, parking may easily convert to retail/commercial/manufacturing/housing. Holmes is providing structural and fire engineering, having obtained one of the first mass timber permits from the Los Angeles Department of Building & Safety.

Mass Timber Commercial Office 42XX at 4204 Glencoe in Marina del Rey Los Angeles Area Southern California, Facade Render

We knew we wanted to include mass timber for sustainability goals. When sourced responsibly, mass timber reduces the embodied carbon impact of a building structure. With mass timber’s biophilic aspect, it feels good to be in there—especially in this post-pandemic climate. For a space that is conducive to good work, this is hard to beat!

Jose H. Machuca, Associate Principal
Mass Timber Buildings under construction in Marina del Rey Los Angeles Southern California
Construction progress - photo by Morley Builders
Mass Timber Buildings topped out in Marina del Rey Los Angeles Southern California
3 mass timber buildings topped out - photo by Morley Builders

Structurally, Holmes reduced the project’s Global Warming Potential with a sleek hybrid mass timber and steel system (plus concrete podium). The use of CLT and glulam substantially lighten the buildings’ mass and material quantities. The team diligently exposed CLT at the roof diaphragms sans concrete topping, preceding codification. Holmes also optimized panel dimensions with the manufacturer to minimize waste during fabrication. Going further, Holmes specified gaps between panels for optimal MEP routing at the decks. Ultimately, the team estimates that the hybrid structures save the equivalent of taking 262 cars off the road for one year.

Holmes provided a comprehensive fire and life safety strategy at all phases. Fire engineers leveraged in-depth knowledge of mass timber performance in relation to the California Building Code to inform constructible designs.

Mass Timber Panel Installation Between Glulam Beams in Southern California at 42XX in Marina del Rey Los Angeles County
Installing CLT panels between glulam beams, left exposed at roof level
Mass timber construction with CLT Diaphragms at 42XX in Marina del Rey Los Angeles Southern California
CLT diaphragms shine in the Southern California sunshine - photo by Morley Builders

An exposed concrete stair leads to an outdoor terrace and elevated walkways allow for seamless access between buildings. Exterior third-floor decks encourage tenants and visitors to spend time outdoors and enjoy the breezy seaside climate.

Exposed CLT Diaphragm and Glulam Columns at Creative Office 42XX in Marina del Rey Southern California
Exposed CLT Diaphragm and Glulam Columns at Creative Office 42XX with elevated walkways and catwalks in Marina del Rey Southern California
Rendering of 42XX at 4204 Glencoe Marina del Rey with Exposed CLT Glulam and Occupants Lounging on Lawn among Landscaping in Southern California

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