Yogyakarta City has a sacred cosmological space formed by imaginary philosophical axes based on the centuries' old Javanese belief system. The Kraton or Sultan's Palace is the focal area with the space around the philosophical axes functioning as a buffer area, and the outer circle that serves as a supporting area. All are linked by the concept of co-habitation space.This paper aims to explain the spatial, philosophical principles in relation to the phenomenon of changes in the urban space in Yogyakarta today. The concept of co-habitation space is physically understood as activities showing guyub (harmony/togetherness) carried out by urban citizens. These can be seen from place attachment, livelihood, and spatial territory. The focus of this research is the sharing phenomenon ('co') that takes place in kampong (urban neighbourhoods) spaces and their surrounding areas.This study uses a rationalistic approach and mixed methods of which the main methods employed were observation and space syntax. The results of this study suggest that the level of guyub in an area is influenced by the local spatial configuration. This study concludes that the concept of co-habitation space affected the way the Sultans of Yogyakarta utilized their kingdom's territory for the welfare of their people.

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<p class="Abstract"><em>This study aims to find the embodiment of ethnic acculturation in the vernacular architectural elements of Pontianak's old houses showing multicultural culture in the past. The Pontianak community has been a multi-ethnic community from the start, with four dominant ethnic groups forming the Pontianak city, namely the Arab, Bugis, Banjar and Riau ethnic groups. The research used a qualitative-rationalistic method with the deeply observed in field case based on the mixed approach between the historical study of the role of each ethnic group and the typology study of architectural building elements. Research sample data in the form of Pontianak old houses are houses built between the early 19th century and the mid-20th century. The results of this study, firstly, the occurrence of ethnic acculturation on the elements of housing architecture in an integrated-assimilative manner. Secondly, the existence of the order of acculturation remained alive in traditional Pontianak community institutions until the mid-20th century shows a strong indication of the continuation of Vernacular Architecture discourse of the Pontianak Malay House.</em></p>