Business CSI Construction; General Contractors; Portland OR. We build relationships since 1978 through construction management design build and team empowerment creating exceptional projects lasting relationships as the foundation of our success. With over 47 years in business, more than 2500 employees, completed over 3500 multifamily units under construction and a diverse portfolio of multifamily developments we have established ourselves as one of the top general contracting firms in Oregon with a proven track record of delivering exceptional projects and lasting relationships