While Inwood, at the very northern tip of Manhattan, is home to the island’s last old-growth forest (in Inwood Park), developers began to construct apartments here at the start of the 20th century, following the completion of the IRT (now the 1 line) in 1906. The many art deco buildings here date from a later boom following the opening of the Eighth Avenue IND (today’s A train) in 1932. Although Inwood isn’t as bucolic as it once was, it has a quieter atmosphere than much of Manhattan. Because most buildings are under 12 stories, and because much of Inwood is covered by its namesake park and is surrounded on water by three sides, it can feel like the borough’s big sky country. Broadway is the commercial heart of Inwood and also is a dividing line of sorts, with the area’s substantial Dominican population concentrated to its east.