In the last 90 days, 1 listings have been made available, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the listings in the Chinatown 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 2,300 sqft. Most properties in this area are approximately 6 stories. Most buildings in this area were built in 1908 and are Class B.