Congregation Kehillath Israel

This is a wonderful Jewish synagogue in the heart of Brookline, MA. A beautiful, large building, with a gorgeous main sanctuary, function hall, large daily minyan, and Hebrew School.
They are open to interfaith couples who choose to raise their children Jewishly; they are open to gay and lesbian Jews; Jews of any ethnic background; Jews by birth and Jews-​by-​choice (halakhic conversions to Judaism); they are open to Jews who range from the very observant to not-​so-​observant.
Their all-​night Tikkun for the holiday of Shavuot is something to be experienced; the best that I have ever gone to.
Make no mistake about it, this is a Conservative Jewish synagogue, in the broadest and most traditional sense of the term «conservative Judaism».
Conservative Judaism, as it was intended by those who developed it, is trans-​denominational, or if you prefer, non-​denominational Judaism. They do not hew to a strictly rigid and narrow set of beliefs (theology) and practices (halakha), like so much of the Orthodox. Nor do they jettison all beliefs and practices, as did most of the Reform. As Reform Rabbi W. Gunther Plaut admitted, «there is no such thing as a [Reform] Jewish theological principle, policy, or doctrine», robbing people of the very thing people seek when they become part of a community, or religion.
Instead, this synagogue follows the classical rabbinic Jewish path of acknowledging there are Jewish principles of faith, but recognizes that no one code of them ever developed canonical status, thus encouraging members to study many Jewish texts on the subject, and approach them intellectually; the same is true for halakhah (Jewish law and custom); Jewish law is considered to be normative (what one is supposed to do, as opposed to a mere suggestion), yet at the same time following the classical rabbinic Jewish path in which more than one interpretation of the law may be considered valid.
This worldview is the basis of classical rabbinic Judaism in the Talmud, and of Conservative Judaism itself, whether or not a synagogue is formally a member of the Conservative movement. By the way, this definition also includes most of the Chavurah movement, the Union for Traditional Judaism, and the more liberal Partnership minyans which are nominally Modern Orthodox :-)