Attempts to rationalize the street system began early. In 1873, the diagonal streets of Auraria and original Denver were renamed, with the zero point at the original southwest corner of Denver, the intersection of West Colfax Avenue and Zuni Street, near the South Platte River. According to this system, still in place in modern Denver, streets running from northwest to southeast are designated as heading north from the zero point and are numbered, while streets running from northeast to southwest are designated as heading east from the zero point and are named. A notable exception came when 23rd Street, which had been treated like any other numbered streets in downtown Denver, was renamed Park Avenue West and designated as running west rather than north, in order to match up with its eastern continuation, Park Avenue, which extends diagonally south-east into the otherwise compass-oriented grid east of Broadway.