Most listings are in the $60's per square foot per year. The Manhattan Beach submarket is going through a a boost in rates. In the last 3 months, the median rate went up $63 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Manhattan Beach submarket has higher rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 13 listings have been listed, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 38% of the office spaces in the Manhattan Beach 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,610 sqft. Most buildings in this market are around 6 stories. Most buildings in this area were built in 1983 and are Class B.