In the last 90 days, 1 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 100% of the available space in the Monterey Park 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,150 sqft. Most buildings in this area are around 3 floors. Most buildings in this market were built in 1982 and are Class A.