In the last 90 days, 0 listings have come on the market, which means new availabilities might be going fast. You'll want to be prepared to make an offer immediately. About Inf% of the available leases in the Rosemead are subleases, so you might be able to find a shorter term or below market rent. 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 1,450 sqft. Most buildings in this area were built in 1982 and are Class B.