On average, listings lease in the $30's per square foot per year. The El Monte submarket is going through a decline in rates. In the last 3 months, the median rate fell $9 per sqft per year. That's a 22% decrease in rent.
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 region.
In the last 90 days, 3 listings have been posted online, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 33% of the office spaces in the El Monte are subleases, so you might be able to snag a great spot on a short term. 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 1,080 sqft. Most buildings in this region are around 2 stories. Most buildings in this region were built in 1974 and are Class B.