CREATE TABLE table_203_777 (id DECIMAL, "years" TEXT, "building" TEXT, "city" TEXT, "height  ( ctbuh ) " TEXT, "floors" DECIMAL)

what was the tallest building in canada after the toronto dominion center ?
SELECT "building" FROM table_203_777 WHERE "years" > (SELECT "years" FROM table_203_777 WHERE "building" = 'toronto-dominion centre') ORDER BY "years" LIMIT 1
SELECT "building" FROM "table_203_777" WHERE "years" > (SELECT "years" FROM "table_203_777" WHERE "building" = 'toronto-dominion centre') ORDER BY "years" NULLS FIRST LIMIT 1