A 44-floor downtown apartment tower at the southeast corner of East Third and Brazos Streets by Houston-based multifamily developer the Hanover Company has cleared its first hurdle on the long road from the drawing board to reality. At a meeting earlier this week, Austin's Historic Landmark Commission approved the certificate of appropriateness for the demolition of the 1904 brick structure now standing atop the 0.4-acre tract at 201 East Third Street, where the 306 . . .