In the heart of East Hampton Village, a plan to build a tennis court angered one neighbor and, when its proposed location was changed in response, drew an objection from another neighbor. The tennis court is to be built on the former Gardiner estate, at 127 Main Street, which is now owned by Shahab Karmely. His property and that of the first neighbor who objected, Kenneth Kuchin of 123 Main Street, are for sale.