Most listings are in the $20's per square foot per year. The Yorba Linda region is seeing a a boost in rates. In the last 3 months, the median rate rose $29 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Yorba Linda submarket has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 0 listings have been posted online, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the available leases in the Yorba Linda are subleases, so you might be able to find a shorter term or below market rent. 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 980 sqft. Most properties in this market are close to 2 stories. Most buildings in this region were built in 1986 and are Class B.