As Farmington residents are surveyed about what to do with the historic section of the existing high school, a retired community leader is suggesting it should become the new town hall. Combining municipal offices and school administrative offices in that space would solve several problems in one move, Stockwell wrote. Her suggestion is among numerous ideas that a special committee will consider this year as Farmington prepares to raze its high school and build a modern replacement. The current high school is a sprawling patchwork of additions and enlargements built over many decades, and taxpayers agreed last year to build a replacement alongside it for up to $135.6 million. The town will put in as much as $110 million, with the state expected to contribute $26.3 million.