On average, listings lease in the $0's per square foot per year. The Del Mar submarket is seeing a decrease in rates. In the last 3 months, the median rate decreased $58 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 0 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the office spaces in the Del Mar are subleases, so you will probably have to consider a longer term 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 sqft. Most buildings in this area were built in 1985 and are Class C.