Write SQL query to solve given problem: Give the street number of a bar in Oakland with a 2.7 review.. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.street_num FROM generalinfo AS T1 INNER JOIN location AS T2 ON T1.id_restaurant = T2.id_restaurant WHERE T1.review = 2.7 AND T2.city = 'oakland' AND T1.food_type = 'bar'