On average, listings lease in the $30's per square foot per year. The Lafayette submarket is seeing a decline in rates. In the last 3 months, the median rate fell $8 per sqft per year. That's a 17% decline in rent.
Compared to the rest of the East Bay market, the Lafayette region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 21 listings have been made available, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 10% of the office spaces in the Lafayette are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,240 sqft. Most buildings in this market are approximately 3 stories. Most buildings in this area were built in 1979 and are Class B.