Compared to the rest of the San Diego market, the Lemon Grove region has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 5 listings have been made available, which means listings 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 780 sqft. Most properties in this market are around 2 floors. Most buildings in this area were built in 1985 and are Class Class C.