In the last 90 days, 0 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About NaN% of the listings in the San Juan are subleases, so you will probably have to consider a longer term lease. 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 sqft. Most properties in this region are close to 1 floors. Most buildings in this market were built in 1972 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Wholesale trade is the dominant industry in this market. Most of the folk of San Juan work from home. Commuting around 30 minutes a day is the norm for those who opt to reside in this part of town.