The typical asking rate per listing is in the $20's per square foot per year. The Orange County region is experiencing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 3% decline in rent.
In the last 90 days, 442 listings have been listed, so you'll want to check back regularly for new listings. About 5% of the available space in the Orange County are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 2,200 sqft. Most buildings in this region are around 2 stories. Most buildings in this region were built in 1986 and are Class A.