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The Aru-Söylemezoğlu plan (1955)

By the 1950s, Gaziantep's rapid growth was outpacing the Jansen plan's limits, resulting in the creation of unplanned settlements (such as Karşıyaka in the north and Düztepe in the south) and prompting the creation of a new city plan. This plan, drawn up by Kemal Ahmet Aru and Hamit Kemali Söylemezoğlu in 1955, continued the basic principles of the Jansen plan while adding some revisions. The city's shape remained compact and focused around a single center, which was now being extended towards the south and west.

The main goal of the Aru-Söylemezoğlu plan was to provide new housing to meet the needs of the growing urban population. There was also an effort to shift from agriculturally-oriented economy to industrial.

Among the important features introduced in the Aru-Söylemezoğlu plan were the railway station, now in its current location, and the addition of the new İpek Yolu highway as a northwards continuation of İstasyon Cd. The new planned upscale residential neighborhoods of Bahçelievler, Kavaklık, and Öğretmenevleri signalled a shift towards building new neighborhoods to the southwest. Ordu Cd, a westward extension of Atatürk Cd, was opened up, and the Kilis-Aleppo axis shifted to this route. In general, the Aru-Söylemezoğlu plan planned a grid plan for the city's streets.

The area north of Alleben Creek, which under the Jansen plan had been designated as recreational areas, were converted into residential development under Aru-Söylemezoğlu plan. Several small new industrial areas were also developed around Nizip Cd, Araban Yolu, and İpek Yolu.