The 1937 realignment and the Route 66 commercial peak
Route 66 was originally commissioned in 1926 with a New Mexico routing that ran north-south through Santa Fe and Bernalillo, descending to Albuquerque from the north before heading west toward Gallup and Arizona. The 1937 realignment shifted Route 66 to a direct east-west routing across central Albuquerque along what was then Central Avenue, eliminating the Santa Fe detour and shortening the cross-state distance substantially. The realignment was politically controversial — Santa Fe businesses lost substantial through-traffic — but it created the dense Albuquerque Route 66 corridor that defines the city's Mother Road heritage today.
The 1937-through-1960 commercial peak built out the corridor with hundreds of motor courts, diners, service stations, and tourist-oriented businesses. Albuquerque's combination of a substantial city population (around 40,000 in 1940, growing to 200,000 by 1960) and the cross-country Route 66 traffic flow created a viable economic environment for commercial buildings designed primarily for highway travelers. Most of the surviving Central Avenue Route 66 architecture dates from this 1937-through-1960 window and reflects the era's commercial architecture — neon signage, streamlined moderne and Pueblo Revival facades, and motor-court forms with parking facing the street.
Route 66 was gradually decommissioned starting in the late 1960s as Interstate 40 replaced it across the United States. The Albuquerque I-40 alignment was completed by the late 1970s, running roughly two miles north of Central Avenue and bypassing the historic downtown corridor. The bypass produced predictable economic effects — many motor courts closed or shifted to lower-rent extended-stay uses, several theaters closed, and the corridor's tourist-traffic dependency disappeared. But the urban density of Albuquerque preserved most of the corridor's commercial buildings even as their uses shifted, and substantial preservation efforts beginning in the 1990s have stabilized the surviving Route 66 architecture for ongoing use.