Most listings are in the $30's per square foot per year. The Hacienda Heights region is going through a a boost in rates. In the last 3 months, the median rate increased $40 per sqft per year. That's a Inf% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Hacienda Heights submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 1 listings have been posted online, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 800 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this market were built in 1979 and are Class B.