Thanks to Andrew Pendleton for commenting on my 04-07-2016 "what businesses typically fit into 28,000 square feet?" post -- regarding the One Florida proposal dropped on our laps earlier this week.
I have copied in his response below:
See this grocery store map to get a sense of scale: http://wdcep.com/wdcep-map-of-the-month-dc-area-grocery-stores/
The planned lower-level retail (18k square feet), if occupied by a single tenant, would be just a bit bigger than the Trader Joe's at 14th and T (15k sf). It's about 3x as big as the Yes Organic Market at 14th and V (6k sf), or about a third the size of the Noma Harris Teeter (58k sf).
It doesn't seem like they're looking for a single tenant to occupy the whole building (28k sf), but if they did, it would be a little smaller in square footage than the Foggy Bottom Whole Foods (36k sf).