Robert Lenox 's son James Lenox divided most of the farm into blocks of building lots and sold them during the 1860s and 1870s ; he also donated land for the Union Theological Seminary along the railroad right-of-way , between 69th and 70th Streets , and just north of it a full square block between Madison and Fourth Avenue , 70th and 71st streets , for the Presbyterian Hospital , which occupied seven somewhat austere structures on the plot ; He built the Lenox Library on a full block-front of Fifth Avenue , now the site of the Frick Collection .
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