Grand Central Block

Costigan Integrated is assisting Unico Properties to rehabilitate the Grand Central Block of buildings, a 116,000-square-foot-assemblage of three adjacent, turn-of-the-century buildings in Pioneer Square, which Unico purchased in November 2014.

The buildings include the Grand Central Building, City Loan Building, and Buttnick Manufacturing Building. Unico would like to activate Occidental Square Park, invest in significant capital upgrades to rehabilitate and protect the unreinforced masonry (URM) assemblage, and adapt the use of the buildings from office to multifamily housing, thereby bringing 24-hour residents to mixed-income apartments and vitality to Pioneer Square. Unico’s three goals—activate the square, rehabilitate the buildings, and adapt the use to multifamily housing—directly align with the “Pioneer Square Neighborhood Plan for 2020,” a plan published by a joint partnership between the Alliance for Pioneer Square, Pioneer Square Business Improvement Area, and the City of Seattle Office of Economic Development.

Adding residential housing to the Grand Central Block would bring approximately 200 residents who would live, dine and shop in the District and create a 24-hour residential presence in the neighborhood. The potential of future residents at the Grand Central Block further fuels the momentum of retail, residential and office activity in Pioneer Square and adds to the renaissance and vibrancy of the District.

As a dedicated steward of the Pioneer Square community, Unico is a member of the Alliance for Pioneer Square, the Downtown Seattle Association (DSA) and its Metropolitan Improvement District (MID). Unico has also pledged to make a significant contribution to the Seattle Parks Foundation for public improvements to Occidental Square Park.
For more information about the Grand Central Block rehabilitation project, visit

Scope of Services

Selection and management of consultants and contractor
Management of budget and cost control
Contract negotiation
Development of building standards program
Signage management
Oversight of hazardous material removal

Image Credit: Graham Baba Architects and Studio 216

View All Projects