IRVING, TX-The Archon Group's headquarters in the Las Colinas Urban Center is on the market, action reportedly jumpstarted by the seller's promise to stay put in about 100,000 sf for the next five years. It is the fifth trophy office building in the Dallas area to make an owner's “to go” roster.

An investment sales source tells GlobeSt.com that the rash of trophy buildings now up for sale is definitely not a fire sale and not a sweet spot for bottom fishers. It's a negotiating marketplace just for the well-heeled investment community. The lookers reportedly are plentiful and the starting prices hushed.

Archon, a wholly owned subsidiary of Goldman Sachs, and the Whitehall Funds co-own 600 Las Colinas Blvd., a 510,000-sf, 22-story structure that's 83% occupied. Its lead tenant, JPI, also headquarters in its 118,000 sf.