New York architect Michael Wyetzner is well-versed in the history of New York City buildings. He explains the basic layouts of the most common types of apartments in the city, which are brownstones, railroad apartments, the classic six, lofts, and studio apartments. But more than descriptions, he gives us the history that explains why they are all different. They each had an original purpose to fill a need at the time they were designed. They all have their quirks because so many are historical landmarks that are grandfathered into today's zoning laws and building standards. In other words, there is no way you could afford to replace these buildings at anywhere near their original quality to get them up to code. Together, they contribute greatly to the unique vibe of New York City. -via Laughing Squid