The typical asking rate per listing is in the $10's per square foot per year. The Escondido region is seeing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 5% decline in rent.
Compared to the rest of the San Diego market, the Escondido submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 17 listings have been posted online, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 2,080 sqft. Most buildings in this region are close to 2 floors. Most buildings in this market were built in 1986 and are Class A.