This is the fairly understated office of Mary Lou McDonald TD (Sinn Fein, Dublin Central). 

The office is located about 200 metres from the main entrance to Connolly Railway Station. I was literally passing by, when I saw the small plaque near the door and went across the street to take a photograph.

I dont know why it is so apparently anonymous. Is it perhaps a condition of the lease? Indeed from across the street, there is no way of knowing that it is the office of a possible Leader of Sinn Fein. At least, the location is handy if she ever wants to go north for any reason.Just a five minute walk and she is on a Belfast train. Two and a half hhours later and she is in Belfast.

But the Internet Connexion on the train is terrible.