Urban Palimpsest

Urban palimpsest is a socio-spatial and architectural concept that refers to a city’s physical, spatial, and cultural fabric accumulating layers of traces from different historical periods, social practices, needs, and ideologies.^【1】 The term derives from the Greek words palin, meaning "again," and psestos, meaning "scraped," combining to form palimpsēstos.^【2】 In antiquity, due to the rarity and cost of parchment and papyrus, manuscripts with erased or scraped-off older texts rewritten on top were termed palimpsests in paleography.^【3】 In this form of recycling, traces of the underlying older text do not vanish entirely and remain legible alongside the newer layer on the same surface.^【4】

^{Tarihi Osmanlı Bankası (SALT Galata) Binasının Dış Cephe Mimarisi (}Unsplash⁾

Since Thomas De Quincey’s 1845 article introduced the concept beyond literature, palimpsest has served as a metaphorical and analogical framework in fields such as architecture, urban sociology, geography, and cultural studies.^【5】 In the context of space and the city, urban palimpsest denotes the analogy whereby each new spatial layer carries traces of the past, simultaneously sustaining history, the present, and the future within the same spatial plane.^【6】 In this sense, the concept is regarded as a dynamic theory that explains collective memory, architectural transformations, and identity construction through layers of space that are written over and erased.^【7】

Interpreting space as a palimpsest argues that it is not merely a physical object or geometric plane but an existential "place" shaped by human experience, social processes, and the accumulation of time.^【8】 Architecture and urban historians have developed this analogy to describe situations in which material and symbolic elements from different historical periods coexist within a building or urban site.^【9】 These interwoven layers, bearing traces of global and regional dynamics, become active catalysts shaping the present and future of urban space through their convergence rather than their separation.^【10】

^{Kapadokya İbrahimpaşa (Babayan) Köyünde Geleneksel Sivil Taş Mimari ve Kaya Oyma Katmanlarının Bir Arada Bulunduğu Yerleşim Dokusu (}Anadolu Ajansı⁾

The urban palimpsest is directly linked to the continuity of social and collective memory. As Maurice Halbwachs noted in his theory of "collective memory," individual memories require concrete carriers such as space, image, and object to exist within a social context of belonging; place and memory constitute an inseparable whole.^【11】 Similarly, Gaston Bachelard characterizes space as a repository of memory, while Martin Heidegger defines such socially shaped, time-bound spaces as "existential space" (place).^【12】 The French poet Baudelaire compared the human mind and memory to a palimpsest, asserting that overlapping thoughts and images never truly disappear.^【13】 Thus, the stratified material pasts within urban space have the power to anchor new cultural and functional activities to that location.^【14】

Changes over time in social structures, needs, technological conditions, and environmental standards lead to the functional or structural (physical) obsolescence of buildings.^【15】 To ensure the sustainability of reference buildings and urban areas, "adaptive reuse" and repurposing projects have become inevitable methods.^【16】 Adaptive reuse aims to preserve a building’s character while integrating contemporary systems and assigning new functional values to space.^【17】

In the process of spatial transformation, the palimpsest effect is achieved by interweaving the old fabric with the architectural language of the new era, without erasing the traces of the past and its accumulated layers.^【18】 Accordingly, creating a "old-new contrast" (contrast aesthetics) through material and construction techniques in transformed spaces is a typical palimpsest application.^【19】 In contemporary architectural interventions, transparent and lightweight materials such as glass and metal (steel) are frequently preferred to highlight the existing historical structure and establish a clear interface between old and new.^【20】 Preserving the architectural palimpsest quality and the original urban spirit (Genius Loci) depends on balancing the symbolic significance of tangible and intangible heritage, embracing innovative contemporary designs, and sustaining urban rituals.^【21】

The primary architectural intervention types that either constitute the urban palimpsest structure or realize spatial transformation during adaptive reuse are as follows:

• New Buildings and Mass Additions: When the existing building cannot meet spatial or technological demands of a new function, additional structures are constructed without compromising the original integrity.^【22】 These additions may either harmonize with the existing form or create contrast.^【23】
• Roof Additions: This involves vertically expanding a building’s capacity. Roof additions employ new materials and technologies to achieve visual harmony with surrounding structures, introduce natural light into interior spaces, and preserve the building’s character.^【24】
• Interior Composition and Structural Systems: Functional deficiencies are addressed through mezzanines or new staircase systems.^【25】 Strengthening worn structural elements (columns, beams, slabs) with modern materials such as steel, or exposing the raw structural fabric, enhances the sense of layering within the interior space.^【26】
• Circulation and Complementary Systems: Integration of new horizontal and vertical circulation systems, such as glass or steel elevators and stair towers, to facilitate movement between units.^【27】 These systems serve as interfaces that mediate the perception of older layers.^【28】
• Material and Technical System Management: Integration of building automation, HVAC, and lighting systems into the historic fabric without damaging it, to meet contemporary physical standards.^【29】

Throughout history, Istanbul, having hosted civilizations such as Rome, Byzantium, and the Ottoman Empire, is a quintessential example of a palimpsest city with its collective memory layered and rewritten over time.^【30】 Industrial heritage sites, concept hotels, and cultural structures in the city stand as tangible witnesses to this multi-layered structure:

^{Esma Sultan Yalısı Dış Kabuk Dokusu (}Anadolu Ajansı⁾

• SALT Galata (Former Ottoman Bank): Designed by architect Alexandre Vallaury on Voyvoda Caddesi, the building originally served as the administrative center of the Ottoman Bank and the Tobacco Regime. Under Han Tümertekin’s management, it was repurposed by removing later additions.^【31】 New circulation schemes, a glass roof addition, the conversion of former vault rooms into exhibition spaces, and preserved historical layers make it a clear example of a "building that works through addition."^【32】
• İspirto Fabrikası (Vakko Hotel Sumahan Bosphorus): Located in Çengelköy, this late 19th-century Ottoman industrial architecture complex was transformed from its original functions as a warehouse, spirit distillery, and stone quarry into a boutique hotel.^【33】 The masonry-built Tapasuma Restaurant section was preserved intact; steel-clad columns, vaulted ceilings, French-made steel trusses, and reused bricks from the original structure have been incorporated into interior surfaces to interweave its industrial past with modern comfort.^【34】
• The Marmara Esma Sultan Yalısı: The 1873 yalı in Ortaköy, which survived a fire leaving only its outer stone shell, has been converted into a multi-purpose event space by inserting a glass and steel structure within.^【35】 The coexistence of the historical exterior envelope and the modern transparent interior structure exemplifies a radical approach to preserving the urban palimpsest through outer shell retention.^【36】
• Industrial Heritage Buildings: Witnessing Istanbul’s 19th-century industrialization, the Terkos Water Pump Station (Terkos Water Civilizations Museum), Feshane-i Amire (Artİstanbul Feshane), Cibali Tobacco and Cigarette Factory (Kadir Has University and Rezan Has Museum), and Hasanpaşa Gasworks (Müze Gazhane) have been transformed into contemporary cultural and educational spaces while preserving their original layouts, high ceilings, brick and stone walls, and arched windows.^【37】

^{Berlin Yahudi Müzesi Ana Binasının Dış Cephesi ve Doğrusal Olmayan Pencere Yarıkları (}Unsplash⁾

In addition to these examples, the Jewish Museum in Berlin can also be cited as an urban palimpsest. Designed by architect Daniel Libeskind, the building constructs its form by superimposing data drawn from the collective memory of Berlin’s Jewish community—lines, angles, and fractures—like a palimpsest.^【38】 The mass and facade dissonance between the 1735 Old Prussian Court Building (Baroque style) and the expressive zinc-clad new structure creates a two-way palimpsest aura that materializes the temporal and spatial distance between two distinct architectural eras.^【39】 Spaces such as the Holocaust Tower and the Garden of Exile, presented to visitors, use architectural elements—inclined floors, light leaks, iron faces—to evoke the traces of the past and ensure the continuity of memory.^【40】

Urban palimpsest and architectural layering can be vulnerable to manipulation due to ideological interventions or commercial interests.^【41】 Dominant powers or specific groups may consciously erase or obscure certain historical layers within urban memory to manipulate cultural identity and distort historical information.^【42】 Similarly, neoliberal spatial production processes and unregulated urban transformation policies risk homogenizing the genuine historical depth of space, reducing the city to a uniform consumer object or an artificial "nostalgia/concept museum" zone.^【43】 This situation can silence the polyphony inherent in the city’s palimpsest nature, leading to amnesia (memory loss).^【44】 For this reason, the urban palimpsest is regarded as a critical method in preservation theories for defending the multi-cultural layers of cities and the justice of collective memory.^【45】