The developer and architect of the EnviroCenter, a green office project in Howard County, this week announced plans to significantly expand the facility and said he hoped it would serve as a model for future green commercial buildings across the country.

Stan Sersen completed the $1.2 million renovation of a 1905 farmhouse on Waterloo Road in Jessup in 2005. The 5,000-square-foot facility is home to Sersen’s ASG architectural firm, the Green Building Institute and several other green businesses and nonprofits.