St. Louis-based Clayco Inc. has been named design-builder for the U.S. Postal Service’s first two LEED-registered buildings. Plans entail the renovation and expansion of mail processing and distribution centers in Troy, Mich., and Greenville, S.C. Both projects will incorporate a high-performance building envelope, stormwater mitigation, low-flow plumbing fixtures, recycled materials, and high-efficiency HVAC systems, lighting, and controls. The $17 million Greenville project involves renovating the existing 58,000-sf facility and adding a 205,000-sf tilt-up processing and distribution center. The $9.2 million Troy renovation project includes revamping the former 143,000-sf P&DC facility into a hybrid building used for corporate office space and as a carrier annex for local delivery operations.