Most listings are in the $0's per square foot per year. The San Marino submarket is going through a decline in rates. In the last 3 months, the median rate decreased $23 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 0 listings have been made available, which means listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the listings in the San Marino are subleases, so you will probably have to consider a longer term lease. 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 sqft. Most properties in this market are around 2 floors. Most buildings in this area were built in 1961 and are Class B.