Despite complaints from nearby neighbors, West Hartford’s town council on Wednesday night gave a key approval to Continental Properties’ plan for 172 luxury apartments about two blocks from Blue Back Square. At a three-hour-long hearing, several business and community leaders along with Kingswood-Oxford School representatives praised Continental’s proposal as a source of economic development and an estimated $800,000-a-year in new taxes. Town resident Marc Shafer said Continental’s vision of a modern, amenity-rich apartment complex would help persuade young professionals to stay in town rather than moving to bigger cities. If the project advances, Kingswood-Oxford would sell the land at 950 Trout Brook Drive to Continental. That income would be important to the school, said Mark Conrad, treasurer of the trustees board.