Compared to the rest of the Metropolitan Los Angeles market, the Moreno Valley region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 3 listings have been posted online, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the listings in the Moreno Valley 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 570 sqft. Most properties in this market are around 2 stories. Most buildings in this area were built in 1989 and are Class B.