Compared to the rest of the Washington D.C. market, the Marlow Heights submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 4 listings have come on the market, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 325% of the office spaces in the Marlow Heights are subleases, so you might be able to sign a shorter term by taking over a previous 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 470 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1971 and are Class B.