Wilson Porterfield, who represents the pavilion, says it will be the largest complex of its kind in the world. The new facility will be built across the street from the existing one, slightly less than 18,000 sf, at Westminster Promenade development at US 36 and W. 104th Ave. Plans call for an 80-foot high, all-glass pyramid.

"The new Butterfly Pavilion will bring science education and awe under a magnificent glass pyramid," says Westminster Mayor Nancy Heil.

Construction begins in February, with an opening scheduled for March 2002. The city of Westminster, northwest of Denver, will lease the land for the new pavilion to the Rocky Mountain Butterfly Consortium for $1 a year for 75 years. The pavilion will keep $2.1 million from the sale of its old complex to help defray the new building costs, with the balance to split evenly with 50-50 with Westminster, Porterfield says. The current building is valued between $3.2 million and $3.3 million, and the Rocky Mountain Butterfly Consortium board expects to net about $2.5 million from the sale, he adds.