Client
City of Oakland
Scope
Seismic Upgrade, Restoration
Cost
$2.1
million
Completed
2006
Originally built in 1913, the Pergola, designed by Walter Reed, was an example of solid construction. When we investigated it in 2005, the basic structure of the building was intact with no signs of dry rot underneath a 92-year old roof. However, by the spring of 2006, many tiles were broken or missing, and another rainy season would have caused serious damage.
Modern tile manufacturers don't make tiles of the same dimension as those originally used. Therefore, to maintain the historic appearance, we converted pan tiles to cover tiles and purchased new tiles of a slightly different dimension to us for pan tiles.
PROJECT DETAILS
Built in 1913, and damaged in 1989 by the Loma Prieta earthquake, renovation was required for this historic building located in downtown Oakland. The Plaza Building is a seven story steel frame building with masonry infill walls. The building has an irregular trapezoidal shape with less than 2,000 square feet of usable space per floor.
The original 1913 building had an unusual glass curtain wall for the first three floors, with more traditional brick and terra-cotta construction above. Subsequent remodels had compromised the integrity of the curtain wall by adding wood framed operable windows. In addition, the terra-cotta was painted black, as were the sheet metal cornices and wood window sashes.
The goals of the seismic upgrade were negotiated with the city of Oakland to determine the appropriate response to maximize the buildingís performance in the event of an earthquake. The goals of the exterior renovation were to bring this building to a level comparible with the Downtown Historic District and adjacent City Administration Building Complex. This work included brick pointing & replacement, sheet metal cornice repair, correction of water damage and removing lead paint from the terra-cotta.
In addition, a new storefront facade at the lower three floors emulates the original storefront from 1913 with a dark base with ornamental sheet metal. All of the work that affected the exterior of the building was negotiated with the Oakland Landmarks Board prior to construction, and verified in the field during construction to confirm color selection, fitness of materials and conformance to historical design criteria.
