How a 1630 farm town with a college attached became the densest concentration of life-science companies in the United States, by way of three civic decisions in the last hundred years.
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Harvard Yard: The College the Town Was Older Than

Johnston Gate, opposite Massachusetts Hall (1720) and University Hall (Bulfinch, 1815). The colonial-college layer of the walk, read from the gate-line on Mass Ave.

The kiosk at Mass Ave + Brattle + JFK. The contested boundary between Harvard and Cambridge.

105 Brattle Street. Built 1759 for John Vassall Jr.; Washington's Continental Army headquarters 1775-76; Longfellow's home 1837-82. NPS site since 1972.

The structural-argument midpoint. The seam between Harvard-anchored West Cambridge and MIT-anchored East. The 1976-77 City Council recombinant DNA hearings were held in this part of the city.

MIT's 1916 campus. Bosworth's reinforced-concrete Maclaurin Buildings ring the court; the Great Dome anchors Building 10. The first mutation.

Frank Gehry, 2004. Houses CSAIL, which descends from Project MAC (1963) and the MIT AI Lab (1970), both founded at 545 Technology Square one block north. The lawsuit, 2007.

The climax. The 1977 ordinance, the 1980 Harvard-MIT commercialization divergence, the post-2000 cluster. Cambridge is a city; the cluster is downstream of civic decisions.
Weekday mornings or early afternoons, Tuesday through Thursday. The Harvard Yard gate-line is least obstructed before the campus lunch crowd. The Stata Center plaza and Kendall Square are working-day environments built for MIT and biotech traffic; weekends quiet them down but also empty the texture the tour reads. Avoid Harvard commencement week (typically late May) when the Yard is closed for setup and Mass Ave is congested. The Cambridge Office for Tourism lists Harvard Yard access on its visitor page; check current hours before walking out, since the Yard has been periodically closed since April 2024.
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