It is a typical pattern for DC right now, Marr tells GlobeSt.com. "For tenants seeking Class A space in DC, who want in excess of 75,000 square feet, we are seeing firms desiring longer term leases to lock in rates and expansion options at today's pricing."

Indeed, the latest statistic from Jones Lang LaSalle quantify this trend. Renewals continue to comprise an above-average proportion of private sector transaction volume in Washington, DC, JLL's Research Manager Scott Homa tells GlobeSt.com.

"Although government agencies are often signing long-term relocations and expansions, private sector tenants are naturally drawn to renewals in this environment because they're typically the most economical way to achieve strategic real estate goals," he says.

The ability of the Downtown DC market to retain marquee tenants like the Carlyle Group speaks volumes to the stability, durability and desirability of the area, Homa adds. "Although neighboring markets like Northern Virginia may be able to offer considerable tax advantages relative to the District, the amenity base, accessibility and prestige of the downtown market continues to effectively attract and retain tenants. The core downtown markets of the East End and CBD offer a combined vacancy rate of 11.2%, which is deeply below the Metro DC average of 16%."