WHERE THE OLD BECOMES NEW

I. A shul that grew the way a startup grows In February 2022, Rabbi Benjamin Goldschmidt and Avital Chizhik-Goldschmidt announced a new Orthodox congregation on Manhattan's Upper East Side. They had no building, no endowment, and no membership roll. What they had was a thesis: that a serious, intellectually honest, unembarrassed Judaism could attract exactly the people the institutional Jewish world had spent twenty years assuming were lost. For two years the Altneu davened wherever it could — private apartments, the Asia Society, the Pierre. In March 2024 the congregation bought a six-story Tudor Revival townhouse at 107 East 70th Street for $34.5 million. Today it counts roughly 430 member units, and nearly 40 percent of them are under thirty-six — the fastest-growing segment in the room, and the demographic every synagogue in America says it cannot reach. The name is the thesis. Altneu — old-new — is borrowed from Prague's Altneuschul and from Rav Kook's formulation that the shul takes as its motto: where the old becomes new and the new becomes holy. Not old repackaged as new. Old that becomes new, without ceasing to be old. That is a rare institutional instinct, and it is the reason this particular shul is the right first home for what comes next. II. The ceiling every thriving kehillah eventually hits Look at what the Altneu actually operates. A Kollel. A gallery program. Shabbat dinners, including regional ones. Educational forums. High Holiday services at scale. A young-couples track. A membership business with tiered dues — $1,200 a year under thirty-six, $1,800 above it. A calendar that has to be published, an RSVP flow that has to be managed, a community that has to be reached on Friday afternoon and again on Sunday morning. Strip the kedusha away for a moment and describe it operationally: the Altneu is simultaneously an events company, a media company, a membership organization, an education institution, and a commerce hub for a few hundred households who buy from each other constantly. And it runs all of it on tools it does not own. WhatsApp for the groups. Email for the announcements. Eventbrite or Partiful for the RSVPs. Zoom for the shiur. Instagram for the reach. A website for the calendar. Venmo, Zelle, and a payment processor for the money. Six to ten platforms — the YESODI thesis puts the number across Jewish institutional life at over a hundred — each taking a cut, each holding a fragment of the community's data, and not one of them returning a dollar or a data point to the kehillah that generated it. Three consequences follow, and they are the three problems YESODI was built to solve. The community is fragmented across other people's infrastructure. No single view of who is engaged. No portable list. If a platform changes its terms, the shul's ability to reach its own members changes with it. There is no control over the environment. Instagram, TikTok, and LinkedIn have, since October 7th, served antisemitic content