Carbon 56

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About Carbon 56

Carbon 56 is a Mid-Rise building in Denny Triangle, Seattle. Built in 2004 with 56 residences across 5 stories.

Monthly HOA fees range from $400–$900. The building has a Walk Score of 97.

Building Details

56 units confirmed · 2015 Terry Ave · Denny Triangle · formerly Aristo Apartments · KC Assessor Tier 1 check in progress

Carbon 56 is a 56-unit condominium at 2015 Terry Avenue in Seattle’s Denny Triangle, converted from the former Aristo Apartments rental property in 2004. The building sits on Terry Avenue — one of Denny Triangle’s quieter residential streets — within walking distance of Amazon’s South Lake Union headquarters and the growing dining corridor along Westlake Avenue.

As a rental-to-condo conversion, Carbon 56 occupies a different position in the market than Denny Triangle’s other confirmed building, Cosmopolitan (~253 units, 34 floors, 2007). Carbon 56’s 56-unit scale creates a tighter HOA community with lower administrative overhead and a more predictable ownership experience than the larger tower next door. Buyers who want Denny Triangle’s location without the scale and complexity of a high-rise are the natural audience here.

The building’s 2004 conversion date places it in Seattle’s first wave of urban condo conversions — buildings that have had over 20 years to establish their reserve funds, define HOA culture, and develop resale history. That track record is a meaningful data asset for buyers and sellers alike. Number of stories is pending KC Assessor Tier 1 confirmation.

At 56 units, Carbon 56 offers the kind of tight-knit ownership community that larger buildings can’t replicate. HOA meetings are manageable, neighbors are recognizable, and building decisions move faster than in 200-unit towers. Buyers who’ve lived in a large high-rise and found it impersonal often find smaller converted buildings a significant quality-of-life upgrade.

Frequently Asked Questions

Where is Carbon 56 located in Seattle?

Carbon 56 is at 2015 Terry Avenue in Seattle’s Denny Triangle, within walking distance of Amazon’s SLU headquarters and the Westlake Avenue dining corridor. The building is in the Denny Triangle neighborhood — confirmed by the SCA Master Building Registry after resolving a prior Capitol Hill neighborhood flag. Jeff Reynolds can arrange private tours of available units.

How many units does Carbon 56 have?

Carbon 56 has 56 condominium units, converted in 2004 from the former Aristo Apartments rental property. Unit count is confirmed from multiple sources. Stories are pending KC Assessor Tier 1 verification.

What was Carbon 56 before it was a condo?

Carbon 56 was formerly known as Aristo Apartments, a rental property that was converted to condominiums in 2004. Rental conversions of this era in Seattle’s urban core typically retained original construction bones while upgrading unit finishes at the time of sale. Buyers should review the reserve study and HOA meeting minutes to assess what capital improvements have been completed since the conversion.

How does Carbon 56 compare to Cosmopolitan in Denny Triangle?

Carbon 56 (56 units, 2015 Terry Ave, 2004 conversion) and Cosmopolitan (~253 units, 819 Virginia St, 2007) are Denny Triangle’s two registry-confirmed condominium buildings. Carbon 56 is the smaller, more intimate option — a former rental conversion with a tight HOA community. Cosmopolitan is a purpose-built 34-story high-rise with a much larger ownership base and more comparable sales history. Jeff Reynolds represents buyers at both buildings and can walk you through the differences.

How do I contact Jeff Reynolds about Carbon 56?

Reach Jeff Reynolds at jeff.reynolds@compass.com. He provides buyer representation, seller representation, and HOA document review for Carbon 56 and all Denny Triangle buildings, with 20+ years of Seattle condo expertise.