SmithGroupJJR reported the largest improvement among its peers in general building. Its revenue nearly doubled, to $54.5 million in 2014, from $27.5 million in 2013. The firm is on the design team for the $870-million MGM National Harbor casino project underway in Prince George's County, Md., outside Washington, D.C.

General building firm Ayers Saint Gross also rose through the ranks this year to No. 30, from 43rd in last year's ranking, thanks to a nearly 50% increase in revenue. The firm's George Washington University District House project in Washington, D.C., was its largest to break ground last year.

Parson Brinckerhoff, which was acquired by Canadian-firm WSP last year, reported an $11.4-million mid-Atlantic revenue increase. Although transportation remains PB's largest sector, $8.7 million of its 2014 revenue increase came from general building.

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