On average, listings lease in the $20's per square foot per year. The Alhambra region is going through a a rise in rates. In the last 3 months, the median rate rose $9 per sqft per year. That's a 44% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Alhambra submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 5 listings have been listed, which means new listings might be going fast. You'll want to be prepared to tour spaces as quick as possible. 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 990 sqft. Most properties in this area are around 3 floors. Most buildings in this region were built in 1985 and are Class B.