As the town weighs whether to move forward with the project or seek a new developer, the Legislative Council has granted another contract extension to the Mutual Housing Association of South Central Connecticut, the local nonprofit slated to build 87 units on the site of Hamden’s abandoned middle school. But the contract’s expiration in July put the future of the site, abandoned years ago due to contamination, in limbo. In order to reevaluate the plan, the council granted Mutual Housing two three-month extensions, one in July and one in October. Then, on Monday, the council granted its third extension in six months, postponing a decision until April. When it brought the project to the town, Mutual Housing proposed repurposing the gymnasium into a community center. But as officials have reconsidered the agreement, Mutual Housing has put forward two new options.