Compared to the rest of the Seattle Metropolitan Area market, the Broadway region has higher rates, and you'll need to make a great offer to be in this hot region.
In the last 90 days, 10 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 10% of the available space in the Broadway are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 930 sqft. Most buildings in this region are around 4 floors. Most buildings in this market were built in 1920 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Information is the dominant industry in this region. Most of the folk of Broadway work from home. Commuting close to 10 minutes a day is the norm for those who opt to reside in this part of town.