are 1400–1499. Habitable structures in alleys may vary in numbering, either being numbered individually to a named alley, or being numbered to the street on the side that structure is on, possibly with a fractional or letter suffix. Streets may be numbered based on distances, where the house number is based on some mathematical formula according to the distance from the start of the numbering system. As an example, a numbering system can provide 1000 addresses per mile, 500 on each side of the street, amounting to an address pair (odd and even) every 10.56 feet. Thus, a property numbered 1447 may be approximately from the beginning point for the numbering system. Even within these systems, there are also two ways to define the starting point for the numbering system. Some places will start the numbering system at the start of the street itself. Other places will define a numbering system based on a defined point or line, such as a municipal or county boundary, a physical barrier separating a community's sides such as a body of water, or a defined intersection near the center of the municipality, with numbers increasing generally as one gets further from the baseline, regardless of where streets start or stop. Some communities use a railroad through a community as the numerical starting point. Addresses in many cites using a defined point or line roughly follow Cartesian coordinates. History of address numbering in US Many cities and civic groups have made efforts to improve street name and numbering schemes, such as Boston in 1879, Chicago in 1895, and Nashville in 1940 among others. The street grid system of New York City, with its numbered streets and avenues, is attributed to the Commissioners' Plan of 1811. In Chicago, Edward P. Brennan worked in his spare time over 8 years to create a proposal to increase the efficiencies of the street name and addressing system, which was largely approved in 1909. In Hollywood, Florida, Benjamin Israel worked for two and a half years to change three street names in the historic black district of Liberia from those that listed the names of Confederate soldiers in the American Civil War - Lee Street, Forrest Street, and Hood Street - to the names of Liberty Street, Freedom Street, and Hope Street. A local business owner had to supply the $20,000 funding to implement the change. There are places in