The Turkmen State Project Institute undertook a feasibility study in the mid-1960s to forecast Ashgabat's development to the year 2000, and on that basis to develop a new master plan. Up until then the city had largely expanded to the east, but now the plan called for development to the south and west. This plan was used for about 20 years, and led to construction of the city's first four-story apartment buildings in the Howdan () microdistricts, formerly the site of the Ashgabat-South aerodrome, as well as annexation of three collective farms in the near suburbs and their conversion into residential neighborhoods, one of which, Leningrad kolkhoz, to this day is referred to informally by its former name. The plan was reworked in 1974, and this resulted in relocation of several industrial plants away from the city center, and thus creation of the industrial zones to the northwest, south, southeast, and northeast.