This permit will give The Boring Company permission to do some prep and excavation work in a parking lot off 53 New York Avenue NE, next to a McDonald's. The permit was issued on November 29th 2017 and the location could potentially become a station according to The Post.
https://www.washingtonpost.com/local/trafficandcommuting/dc-has-given-elon-musk-a-permit-to-do-a-little-digging-for-the-hyperloop/2018/02/16/ee8d2f08-1359-11e8-9570-29c9830535e5_story.html
https://www.washingtonpost.com/local/trafficandcommuting/dc-has-given-elon-musk-a-permit-to-do-a-little-digging-for-the-hyperloop/2018/02/16/ee8d2f08-1359-11e8-9570-29c9830535e5_story.html