What was current legislator Sherrod Brown's Washington, D.C. office phone number during his term starting on 2013/1/3?
Washington, DC office phone number refers to phone; terms starting on 2013/1/3 refers to start = '2013-01-03';
SELECT T1.phone FROM `current-terms` AS T1 INNER JOIN current AS T2 ON T2.bioguide_id = T1.bioguide WHERE T2.official_full_name = 'Sherrod Brown' AND T1.start = '2013-01-03'