Bethel has accepted a $300,000 offer from Westport builder Sam Lampert for the final parcel in the Clarke Business Park. Lampert plans to build a 16,000-square-foot warehouse and office space on the 3-acre lot near the Danbury border. The deal marks the completion of Bethel’s long-term expansion of the industrial park. Lampert is now seeking approval from the town’s Planning and Zoning Commission to move forward with the project.