The typical asking rate per listing is in the $10's per square foot per year. The Morena submarket is going through a a rise in rates. In the last 3 months, the median rate rose $20 per sqft per year.
Compared to the rest of the San Diego market, the Morena region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 8 listings have been posted online, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 125% of the available leases in the Morena 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,360 sqft. Most properties in this area are approximately 2 stories. Most buildings in this region were built in 1974 and are Class C.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Information is the dominant industry in this region. Most of the folk of Morena work from home. Commuting under 5 minutes a day is the norm for those who opt to reside in this part of town.