Most listings are in the $60's per square foot per year. The Manhattan Beach region is going through a an increase in rates. In the last 3 months, the median rate increased $67 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Manhattan Beach region has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 13 listings have been made available, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 85% of the listings in the Manhattan Beach are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,720 sqft. Most buildings in this region are around 4 floors. Most buildings in this market were built in 1985 and are Class B.