The next wave of downtown office development is taking an increasingly green tint.

Wilson Meany Sullivan has joined Tishman Speyer and Beacon Capital Partners on the list of developers planning to seek gold rating from the Leadership in Energy and Environmental Design. Company principal Tom Sullivan said WMS will apply for LEED gold on the fourth and final Foundry Square building, a nine-story, 200,000-square-foot building that the firm recently began marketing.

Taking advantage of a city planning policy that gives processing priority to developers willing to comply with LEED standards, Tishman Speyer has applied for LEED gold at 222 Second St., and Beacon Capital Partners has applied for 535 Mission St. While the Foundry Square building was entitled in 2000, and therefore won't be in a position to benefit from the city's new green building fast-track system, Sullivan said the original design included enough environmentally friendly features that it will be relatively easy to elevate it to gold status.

These include double-glazed windows, concrete slab construction, and a raised floor for a more efficient and higher-quality under-floor air distribution system. The gold certification will "involve some incremental cost increases, but we felt it was worth it," said Sullivan.