In the last 90 days, 2 listings have been posted online, which means leases 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 posted, 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 buildings in this market were built in 1984.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Utilities is the dominant industry in this market. Most of the residents of Manhasset work from home. Commuting under 5 minutes a day is the norm for those who opt to reside in this part of town.