Compared to the rest of the Metropolitan Los Angeles market, the El Monte region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 3 listings have been listed, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 400% of the available space in the El Monte 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 2,010 sqft. Most buildings in this area are close to 2 stories. Most buildings in this area were built in 1974 and are Class B.