Add annual bike share membership to the metro card benefits. It's only a small additional cost to annual metro benefits--$75 per year is only $6.25 per month. Most workers can travel for free to work since it's free for the first 30 min. If they want to use it longer, they can pay the nominal fee or have it so workers can use their metro card (cheaper than metro). Also this would hep finance more stations at every federal building. Or you could give workers this an an option instead or combined with the metro benefits.
Benefits: healthier workers, better environment