ARC3 Architecture

ARC3 Architecture is a St. Petersburg design firm working across residential, commercial, and mixed-use projects on Florida’s Gulf Coast. The multidisciplinary studio is the architect behind the $225 million Echelon twin-tower development downtown, a pair of 31-story residential towers that rank among the city’s largest housing projects. ARC3 focuses on turning dense, complex sites into buildable designs, the kind of high-rise and infill work reshaping St. Petersburg’s core. The single-office firm handles design from concept through construction documents.

The profile above covers ARC3 Architecture’s larger projects, so this note focuses on the range of work and the studio’s structure. ARC3 is a multidisciplinary St. Petersburg design firm working across residential, commercial, and civic and institutional projects, and that spread is deliberate: a practice that moves between housing, commercial buildings, and public work carries lessons from each into the others rather than specializing narrowly.
Civic and institutional design in particular sits alongside the residential and commercial work, and it brings a different set of demands, public review, accessibility, and long service lives, that sharpen how a firm approaches its other projects. Architectural design runs from concept through construction documents, so the studio stays involved from the first sketches to the drawings a contractor actually builds from.
The firm also provides design and engineering services together, which lets structural and technical questions be worked out alongside the architecture rather than handed to an outside consultant late in the process. For dense or complicated sites, that integration is part of what makes a demanding design buildable.
ARC3 works from a single office and covers St. Petersburg and the wider Tampa Bay area, with a team in the 11 to 50 range. That size is large enough to take on substantial projects while keeping the work coordinated under one roof, close to the Gulf Coast communities it serves.
A single-office studio with a team in the 11-to-50 range is large enough to carry a substantial project through construction documents while keeping the design coordinated under one roof, which is part of what lets a smaller firm take on ambitious high-rise and infill work. Providing architecture and engineering together means the buildability questions that decide whether a dense Gulf Coast site actually works get answered inside the same studio. Across St. Petersburg and Tampa Bay, that integration is the practical draw of a multidisciplinary practice rooted in the market it builds in.