Last 10 Year Transaction Snapshot
$433Mtotal deal volume |
2.4M+ SFsale negotiations |
2M+ SFlease negotiations |
Together, they offer deep transactional experience, strong local market knowledge, and a client first approach grounded in clear communication and dependable follow through. Brian & Spencer bring more than 30 years at Kidder Mathews, with hundreds of completed commercial real estate transactions totaling over 10 million square feet. They provide targeted market analysis, location specific insights, and a data driven advisory style. Their combined expertise provides clients with informed guidance and exceptional service across all stages of the real estate process.
$433Mtotal deal volume |
2.4M+ SFsale negotiations |
2M+ SFlease negotiations |

For over 23 years, Brian has assisted landlords/sellers and tenants/buyers with property analysis, and the negotiation process, as it relates to leasing and selling or purchasing properties. Brian is a highly motivated and responsive professional who prides himself on his follow through and communications skills.

Spencer brings over 6 years of targeted market analysis, location specific insights, and a data driven advisory style shaped by his business marketing degree and competitive athletics background. Their combined expertise provides clients with informed guidance and exceptional service across all stages of the real estate process.
The right choice depends primarily on how long you plan to occupy the space and how much equity you have available. Leasing offers more flexibility for shorter time horizons, while buying can make sense if you plan to stay long-term and have enough equity to invest. Brian Clapp and Spencer Clapp can help you weigh these trade-offs for your specific situation. Many companies only compare a rent payment to a mortgage payment, but the occupancy timeline matters just as much.
A good rule of thumb is to revisit the decision around the three and a half to four year mark of a lease. At that point, it’s worth reevaluating the company’s space needs: staying in the current footprint, expanding into more space if business is growing, shrinking the footprint if finances are tight, or purchasing if enough equity has built up to make ownership the stronger option. Brian Clapp and Spencer Clapp can help walk you through that decision at any stage.
Selling an office, medical, or flex building starts with an accurate valuation, a clear positioning strategy, and targeted outreach to qualified commercial real estate buyers. Brian Clapp and Spencer Clapp market these properties to local, regional, and national buyers, including REITs, private equity firms, and 1031 exchange buyers.
Brian Clapp and Spencer Clapp are two of the most active commercial real estate brokers in the South King County market. Their services go beyond simply finding a property and emailing the flyer to their clients. Through their daily involvement with countless transactions, combined with deep market knowledge, they understand current rents, sale prices, concessions, and vacancy rates. This insight gives clients real leverage in negotiations.
Brian Clapp and Spencer Clapp work throughout South King County, including Georgetown, SoDo, West Seattle, Tukwila, Renton, Burien, SeaTac, Kent, Des Moines, Federal Way, Auburn, Covington, Maple Valley, and other markets statewide.
Brian Clapp and Spencer Clapp specialize in the sale and leasing of office, healthcare, and flex properties throughout the greater South King County market, representing landlords, sellers, tenants, and buyers across all stages of a transaction.
Brian Clapp and Spencer Clapp bring more than 30 years of combined experience at Kidder Mathews and have completed hundreds of commercial real estate transactions totaling over 10 million square feet. Over the last 10 years alone, their production includes $433 million in total deal volume, more than 2.4 million square feet in sale negotiations, and over 2 million square feet in lease negotiations.
The Clapp Team represents landlords, sellers, tenants, and buyers of office, healthcare, and flex properties, including institutional clients such as REITs, private equity firms, and owner occupied buyers. Their client roster includes companies such as Kiewit, Farmers Insurance, Healthcare Realty, and Northwest Kidney Centers, among others.
Brian Clapp, executive vice president and shareholder at Kidder Mathews, can be reached directly at 206.248.7316 or brian.clapp@kidder.com.
Spencer Clapp, first vice president and shareholder at Kidder Mathews, can be reached directly at 253.394.4977 or spencer.clapp@kidder.com.
SeaTac Office Center
Gateway Corporate Center in Tukwila
Time Square in Renton
Washington Tech Center in Renton
Stadium Innovation Center project
Oakesdale Center in Renton
Southcenter Place project in Tukwila
Kiewit Corporation in Renton & Federal Way
The aggregate CRE delinquency picture masks significant divergence by capital source, property type, and lender size—pointing to pockets of stress...
Read More
Few forces are reshaping the office landscape as quickly, or as unevenly, as artificial intelligence. It is fueling some of the strongest leasing...
Read More
Dallas-Fort Worth led the U.S. in 2025 with 87 corporate location expansions across 26 cities, fueled by a workforce that has grown by roughly 450,000...
Read More
Hudson Pacific’s second attempt to restructure $101 million in loans backing Hill7 in Denny Triangle has been denied more than a year after...
Read More
An office complex at 10900 S.E. 176th St. sold this week for over $3.6 million, according to King County records. The seller was Camenzind LLC, which...
Read More
First, it was the Bay Area. Then the wave crashed into New York City. Now, the artificial intelligence leasing frenzy, which just pushed the tech...
Read MoreSubscribe to our mailing list to stay up-to-date on the latest office/flex news and updates.