Another hurdle has been cleared by the developer looking to build town houses on part of the Ridgefield-owned Schlumberger site. The Planning and Zoning Commission and the Inland Wetlands Boards have each voted in favor of the Coach Homes development. The proposal for the 10 acres of land off Sunset Lane calls for 54 units of luxury housing for adults over the age of 55. The $4.3 million sale was overwhelmingly approved by Ridgefield residents in February. The sale must still be finalized, and permit approval is still needed.