Encompass Services Corp., Houston, will provide electrical, plumbing, voice/data, mechanical and custodial services for Colliers International, Boston, a global real estate services organization, and its corporate real estate clients. Colliers is one of the largest global real estate firms, managing 465 million square feet of property internationally. The agreement will enable the two firms to offer one-stop delivery of integrated real estate, brokerage, facility management support and operational services on a national basis. “Clients with multiple locations across the nation need only to make one phone call to develop a solution to meet all their real estate and facilities operational needs, said David Bowden, executive managing director of Corporate Services with Colliers. David Koester, vice president of Business Development with Encompass Business Solutions, said the agreement is based on the trend in Corporate America to move to single outsource providers of real estate, facility management and operational services.