The typical asking rate per listing is in the $30's per square foot per year. The Westminster region is seeing a a boost in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 18% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Westminster region has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 2 listings have been listed, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,350 sqft. Most properties in this market are approximately 1 stories. Most buildings in this region were built in 1973 and are Class A.