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San Lorenzo sits in Florence’s market district like a paradox: one of the city’s key churches, yet still wearing an unfinished façade. Tradition points to an early Christian consecration in 393, but the building you feel is the 15th-century reset, when Brunelleschi gave it a new Renaissance grammar - white planes held in place by pietra serena, proportion doing the work of ornament. It is also Medici territory: their parish church, their long-term building site, and the hinge that links worship to dynasty. Nearby and attached, the complex keeps unfolding into add-ons that change the register completely - the Old Sacristy’s early-domed clarity, Michelangelo’s unrealised façade dream, and the Laurentian Library with its vestibule and stair, begun in the 1520s and realised later. San Lorenzo is Florence building power in public, then leaving the seams visible.