Living with a view of Central Park is wonderful but costly. For example, on the right is 820 Fifth Avenue. The residential property with a Venetian Palazzo façade cost $1 million to build before opening in 1916. It has 12 floors and 12 apartments. Each one commands over $40 million. Its neighbor with the distinctive slopped roof and chimneys is 825 Fifth Avenue. The 23 floors have 64, much smaller units. They tend to sell in the $6 to $7 million range. But a one-bedroom efficiency can be yours for about $1.5 million.