Some might say the FBI has offices there, but I won't.
If a developer made an offer to the GSA (which administratively "owns" the building) that covered the cost of the building, the relocation, an interference with operations factor, and a profit factor, who knows? Why a "profit factor"? Because a large portion of GSA operations is not funded by Congressional appropriation, but by an "eat what you kill" approach toward leases to other agencies and by procurements for other agencies.
So if someone thinks it is economically feasible to tear down the building, step on up with a deal.