D.C.'s 4th EV

[True Federalist (진정한 연방 주의자)]

While that clause did cost DC an EV in the elections before 1984, it's meaningless now unless the size of the House were to be considerably expanded. The district is fully developed now and there's no reasonable prospect that Congress would ever allow changes to the building codes which would allow high-rises to obscure the Capitol or the Mall. Max population for the district is probably 1,000,000 which won't ever be enough for two representatives unless we start seeing major population declines and/or a massive increase in the size of the House. (Even with a cube-root House size, DC would still only get one.)

[True Federalist (진정한 연방 주의자)]

D.C. is filling back in, but it's hard to see how given current building codes in the district designed to ensure that there's loads of public space and that the skyline is dominated by the Capitol and the Washington Monument how it could ever pass the 1,000,000 mark. It would need to exceed that with the current U.S. population to be eligible for a 4th EV even without the clause limiting it to 3.  Making it even less likely is that by the time D.C. could reach 1,000,000, the U.S. population will likely exceed 400,000,000. D.C. itself will never have skyscrapers.