MIRA Tower (aka Folsom Bay Tower) is a new 40-story icon on the San Francisco skyline. With a height of 129.7 m (425 ft), the residential building is rising in the neighborhood known as the East Cut, part of the Transbay Redevelopment Area.
129 m / 426 ft
40 stories tall
The design is an evolution of the classic San Francisco bay window, which twists incrementally over the height of the tower to provide views, light and air to the residential units and, at the same time, improve its energy performance. The project aims to the certification goal of LEED Gold®. The tower is comprised of approximately 44,600 sqm (480,000 sq ft) of residential area subdivided into around 400 units. Additionally, it offers around 900 sqm (10,000 sq ft) of retail space fronting Folsom and Main Streets and sits atop a three-level underground parking structure
Metal panel spandrel units and glass/metal infill units; over 8,000 units for an overall area of around 18,600 sqm (200,200 sq ft).
Originally conceived as GFRC cladding, a number of material choices and unit configurations were studied by the architect, developer, and PNA West design team before arriving at an optimal solution. The facade consists of horizontally configured, insulated 3-dimensional spandrel units clad in white aluminum panels. Panels have been finished with liquid fluoropolymer high performance coating, applied with a technique derived from aerospace technology which was specifically adapted for this project due to the extraordinary dimension of the parts. The spandrel units are rigidly connected to the concrete structure with custom steel and aluminum anchorage arms, and the window units span vertically between them. This configuration achieved the soffit and coping geometry with a unitized approach, while minimizing the overall facade weight. The twisting form is comprised of 20 angled bay modules repeating in both soffits and coping condition and left or right angle. The modules repeat in all bays, but are each offset by one floor to create the dynamic spiraling effect while allowing a degree of repetition.
8,239 unitized curtain wall units
910 3D spandrel units
5,978 infill and visual units
1,351 head track units and handrail for balconies
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