Vitro's Solarban 70 low-e glass anchors the façade of One St. Petersburg, a 41-story luxury condo tower on Florida's Gulf Coast. The project shows why a 20-year-old triple-silver coating still wins warm-climate residential spec sheets—and what its 0.27 SHGC actually means for HVAC sizing on floor-to-ceiling glass.
The Story
Vitro Architectural Glass has published a project spotlight on One St. Petersburg, the 41-story luxury condominium tower that now anchors downtown St. Petersburg's Gulf Coast skyline. Designed by SB Architects and developed by The Kolter Group, One St. Petersburg was envisioned as a signature residential destination featuring floor-to-ceiling windows, private terraces and unobstructed views that strengthened the connection between indoor and outdoor living.
The façade specification centered on Solarban 70 glass by Vitro Architectural Glass, a high-performance solar control low-e glass that helps maximize daylight and views while supporting energy efficiency and occupant comfort. That is not a new product—but the story is a reminder of why a two-decade-old triple-silver coating remains the default answer on high-transparency warm-climate towers.
Why Solarban 70 Still Dominates Warm-Climate Spec Sheets
The product's numbers explain the market position. Introduced in 2005, Solarban 70 glass was the world's first triple-silver low-e glass, and today, it is the most specified glass of its kind in the industry with nearly one billion square feet shipped since its inception.
On a floor-to-ceiling residential tower, three performance metrics drive the decision:
- Visible light transmittance. Delivering a Visible Light Transmittance of 64% Solarban 70 glass supports the tower's expansive glazed façade, filling interiors with natural light and showcasing sweeping views of Tampa Bay, the city skyline and the waterfront.
- Solar heat gain. Thanks to its exceptional solar control characteristics, a Solar Heat Gain Coefficient (SHGC) of 0.27, Solarban 70 glass allows for smaller HVAC systems, which reduces upfront equipment costs and helps lower cooling and heating costs.
- Light-to-solar-gain ratio. A 64% VLT paired with a 0.27 SHGC yields an LSG ratio of roughly 2.37—still among the highest in the market for a color-neutral coating.
That combination is what a Florida developer needs: enough daylight and clarity to sell the view at a $1,000+ per-square-foot price point, but low enough solar heat gain to keep cooling loads inside the envelope of a residential mechanical system.
Practical Implications for Architects and Contractors
HVAC sizing is a real number, not a marketing claim. A 0.27 SHGC on a highly glazed south- and west-facing tower directly reduces peak cooling load per square foot of glass. On a 41-story building with expansive glazed area, that translates into smaller chillers, smaller air handlers, and less structural allowance for rooftop equipment. For value engineering discussions, the glass spec is one of the few line items where a mechanical trade-off is quantifiable at schematic design.
Warm-climate energy codes are catching up to the product. Florida's energy code and ASHRAE 90.1 have progressively tightened SHGC limits for fenestration in Climate Zones 1 and 2. A 0.27 SHGC gives designers headroom to spec larger window-to-wall ratios without triggering prescriptive-path failures—critical on residential towers where 75%+ WWR is a market expectation, not a design flourish.
Color neutrality preserves the design intent. Triple-silver coatings have historically been the compromise product between highly reflective low-SHGC glass and clear-looking glass with high solar gain. On a waterfront tower where the developer is selling water and skyline views, a neutral, transparent aesthetic isn't optional. One St. Petersburg is a residential experience where transparency, daylight and visual connection play a central role in the building's architectural identity. As one of the tallest towers in downtown St. Petersburg, One St. Petersburg demonstrates how high-performance glass can create bright, visually connected spaces that celebrate their surroundings.
The Broader Context
Project spotlights like this one matter because they document what actually gets built when a spec sheet meets Gulf Coast hurricane pressures, high UV exposure, and premium residential price points. The industry is moving fast on vacuum insulating glass, electrochromic coatings, and BIPV façades—but for the vast majority of warm-climate residential and hospitality towers currently in design, the winning combination is still a well-understood triple-silver low-e in an insulating unit, sized and detailed correctly.
For spec writers, the takeaway is not that Solarban 70 is the only answer. It is that when a client demands 64% VLT, color neutrality, a sub-0.30 SHGC, and a proven durability record backed by nearly a billion square feet of field installations, the shortlist is short. On a 41-story tower where the glass IS the product being sold, that shortlist tends to win.