On average, listings lease in the $20's per square foot per year. The Montgomery submarket is going through a a boost in rates. In the last 3 months, the median rate went up $5 per sqft per year. That's a 26% rise in rent.
In the last 90 days, 63 listings have been made available, so you'll want to check back regularly for new listings. About 156% of the listings in the Montgomery are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,410 sqft. Most properties in this region are close to 1 stories. Most buildings in this area were built in 1982 and are Class B.