Most listings are in the $10's per square foot per year. The Washington Terrace submarket is going through a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year.
In the last 90 days, 2 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 150% of the listings in the Washington Terrace are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,700 sqft. Most properties in this area are around 3 stories. Most buildings in this region were built in 1974 and are Class B.