ST. LOUIS — Building "green" is easy when you've been doing it as long as design/build firm Clayco Inc.

"It's funny, we've been committed to building 'green' since 1984–it just wasn't something we really 'marketed' because it is so ingrained in our culture and everyday normal business practice," said Clayco National Director of Business Development Financial Facilities Tom Lombardo.

The firm's efforts haven't gone unnoticed–Clayco recently ranked 10th in the Engineering News Record's Top 50 Green Contractors for 2007. The list ranks contractors based on 2006 revenue from projects that were either registered or certified with a major third-party environmental standards or ratings group. Clayco's ranking was based on $210 million in sustainable project revenue, comprising 33% of Clayco's total revenue.