ABSTRACT
The regeneration of deteriorated and inefficient urban fabrics is a fundamental concern of urban management. It has been frequently addressed in urban planning regulations and various development plans. This is due to the fact that, beyond their broad spatial extent, these urban fabrics carry significant economic, cultural, social, and environmental ramifications. This research evaluates land readjustment in deteriorated urban fabrics with an approach of balanced physical development. It investigates the feasibility of regenerating the deteriorated Masjediri fabric in Zanjan, simultaneously addressing the deficit of standard public spaces while considering various dimensions of urban sustainability. This research is applied in purpose, qualitative and descriptive in methodology, and mixed-methods in nature. The case study area is the deteriorated fabric of the Lower Masjediri district in Zanjan. The research results indicate that, despite sixteen years having passed since the approval and implementation of the city's Detailed Urban Plan, the Lower Masjediri fabric remains spatially, socially, and economically deteriorated and inefficient. However, land readjustment with a balanced physical development approach - as a sustainable solution - demonstrates high potential for spatial reorganization, the creation of standard thoroughfares, and the improvement of the quality of life. Furthermore, spatial justice and urban sustainability can be achieved by allocating 50% of residential and commercial land parcels to compensate for the deficit in standard per capita spaces. Consequently, implementing land readjustment with a balanced physical development approach can facilitate not merely physical changes, but a structural transformation in urban management, fostering spatial justice and enhancing the quality of life within the deteriorated Masjediri fabric of Zanjan.
Extended Abstract
Introduction
Deteriorated and inefficient urban fabrics constitute one of the most complex and fundamental challenges to sustainable urban development in Iran and numerous developing countries. The extensive expansion of these areas, coupled with their multi-dimensional economic, cultural, social, and environmental consequences, poses a serious threat to urban resilience and sustainability. Inherent characteristics of these fabrics, such as severe physical degradation, inadequate urban infrastructure and services, fragmented land parcels, narrow and substandard streets, and high population density, render these areas highly vulnerable to natural disasters - particularly earthquakes in a seismically active country like Iran - and human-made crises.
Traditional urban renewal approaches, predominantly based on the "demolition and reconstruction" paradigm, have frequently failed or proven to be excessively slow and costly due to the need for massive state investment, social resistance caused by forced displacement, and the disregard for property rights and neighborhood social cohesion. In this context, Land Readjustment (LR) has emerged as a sustainable, participatory, and innovative strategy in urban governance, attracting significant attention from both academic and executive circles. Statistics indicate that over 166,000 hectares - equivalent to 23% of urban areas - in Iran are classified as inefficient fabrics. At the provincial level, Zanjan contains 1,200 hectares of deteriorated fabric, of which 511 hectares concentrated in Zanjan city, accounting for 8.3% of the city's total area.
This research aims to assess the feasibility and application of the LR technique in the Lower Masjediri neighborhood of Zanjan, emphasizing balanced physical development - focusing on per capita standards and sustainability dimensions. The analytical framework integrates Bentley’s physical permeability models (University of Oxford), Ziyari’s per capita and public space deficit estimation methods, and the Jenks and Jones sustainability framework. The primary research question is whether LR, approached through balanced physical development, can serve as a feasible and operational spatial planning solution to address standard per capita deficits and enhance the quality of life in this deteriorated fabric.
Land Readjustment is a systematic process wherein owners of scattered, small-scale plots within a designated area voluntarily contribute their land into a "Land Pooling" mechanism. Following the design of a new street network, the provision of standard public and service spaces, and infrastructure upgrades, the plots are returned to the owners with added value, maintaining proportionality to their initial contributions. Rooted in successful experiences in countries like Japan (Kukaku-Seiri), South Korea, and several European nations, this tool enables balanced and equity-oriented development without requiring heavy upfront financial investment from the government.
The theoretical foundation of this research rests on four pillars: (a) The morphology and pathology of inefficient urban fabrics; (b) The principles, processes, and economic mechanisms of LR (particularly the concept of Value Capture); (c) Iranian urban planning standards (regarding per capita spaces); and (d) Sustainable urban development dimensions, with a specific focus on Sustainable Development Goal 11 (SDG 11). A review of the literature reveals a research gap regarding the operational application of the LR model, integrated with balanced physical development indicators and precise spatial-economic balance sheet simulations in mid-sized Iranian cities, which this study aims to address.
The primary objective is to evaluate the feasibility and formulate an operational model for the Land Readjustment technique in deteriorated urban fabrics, emphasizing "Balanced Physical Development." Specifically, it seeks to regenerate the Lower Masjediri deteriorated fabric, compensate for the deficit in standard public and service space per capita, and achieve various dimensions of urban sustainability and spatial justice through this participatory mechanism.
Methodology
This research is applied in purpose and descriptive-analytical in nature, utilizing a mixed-methods approach.
Data Collection: Included library studies (reviewing upstream documents and Zanjan’s Detailed Urban Plan), field surveys, photography, and direct observation of the area's physical condition.
Analytical Tools: Google Earth and ArcGIS software were employed for spatial and physical analyses.
Analysis Method: First, the current land-use and street network were compared with approved standards to calculate the spatial deficit - excluding the LR mechanism. Subsequently, using population projection methods (for the planning horizon of 2036 / 1415 SH, with an estimated population of 2,495) and economic modeling (capturing value added from land-use changes and permissible density increases), the LR scenario was simulated, and the project's final feasibility balance sheet established.
The study area is the "Lower Masjediri" deteriorated fabric in eastern Zanjan. It is bounded by Towhid Street to the north, Sadr Jahan Street to the east, Khayyam Street to the south, and South Saadi Street to the west. According to the approved Detailed Urban Plan, this zone requires serious intervention due to plot fragmentation, narrow streets, and physical deterioration. The total area is approximately 108,854 square meters, predominantly consisting of residential and commercial land uses.

Results and Discussion
Despite the passage of 16 years since the approval of the city's Detailed Urban Plan (2009), analyses indicate that the area remains physically, socially, and economically deteriorated and inefficient. Key quantitative findings include:
· Street Network: Approximately 49.77% of the total street length has an average width of less than 6 meters, severely hindering emergency and vehicular access. Currently, only 13% of the fabric is allocated to streets, far below the 20–25% minimum standard approved by the Supreme Council of Urban Planning and Architecture of Iran.
· Land Use and Per Capita Deficit: Residential (59.3%) and commercial (18.9%) uses dominate. Calculations show a severe spatial deficit. Without the LR mechanism, the total spatial deficit for urban uses (educational, health, green spaces, etc.) and street widening is estimated at 41,649 square meters.
· Land Readjustment (LR) Modeling: The research demonstrates that allocating 50% of residential and commercial land areas - through owner participation and land redistribution - can compensate for this deficit. To incentivize owners and offset the reduction in plot area, three economic and physical mechanisms were designed:
A 20% increase in the monetary value of each redeveloped plot compared to the current state.
Permission for mixed-use development (commercial on the ground floor of residential buildings) with incentive coefficients.
Increased building density: Applying a 60% footprint ratio with permission to construct 4 residential floors.
· Final Spatial-Economic Balance Sheet: By applying permissible densities and coefficients within the LR framework, the total buildable floor area in the zone reaches 99,049.68 square meters. Meanwhile, the total spatial deficit, after deducting public areas and street widening - accounting for value capture and compensatory mechanisms - is estimated at 90,268.4 square meters. Consequently, the project's spatial-economic balance sheet is positive, definitively guaranteeing the economic viability of the plan for owners and investors through the surplus building capacity.
· Physical Achievements: Implementation will create a network of streets with a minimum width of 10 to 12 meters, increase physical permeability, and establish a standard spatial hierarchy, directly reducing seismic vulnerability and improving public transport accessibility.

Conclusion
The synthesis of analyses demonstrates that Land Readjustment, approached through balanced physical development, is not merely an engineering tool, but a transformative mechanism in urban governance. By avoiding forced displacement and preserving private property rights, it realizes Spatial Justice through the equitable distribution of development-generated value. For the Lower Masjediri area, this research proves that despite legal and social challenges, implementing LR is entirely feasible. This strategy takes a significant step toward achieving urban sustainability dimensions (SDG 11) by providing standard per capita spaces, enhancing safety and resilience, and improving environmental quality. Its proven success in countries such as Japan and South Korea, coupled with its adaptability to Iran's local requirements, makes it a superior and more sustainable alternative to traditional demolition and renewal methods. However, its accomplishment necessitates legal reforms, the establishment of dedicated governing bodies, and transparent mechanisms for owner and community participation.
8. Practical and Policy Recommendations
Based on the findings, the following strategies are recommended for urban managers, planners, and policymakers to facilitate the LR process:
1. Founding a Dedicated, Transparent Institution: Creating an independent task force or entity at the municipal level (involving the private sector, financial institutions, and elected owner representatives) to manage the LR process transparently, preventing conflicts of interest and building public trust.
2. Regulatory and Local Bylaw Reforms: Developing clear regulations for calculating owners' contributions, compensating for potential losses, and utilizing innovative financing mechanisms such as Value Capture and issuing municipal green bonds to fund public infrastructure without burdening the municipal budget.
3. Transparent, Multi-stage Community Participation: Utilizing advanced visualization tools such as 3D GIS models and Virtual Reality to demonstrate the future benefits of the plan to owners, holding local workshops, and involving residents in decision-making from the initial stages to mitigate social resistance.
4. Phased Implementation (Pilot Projects): Due to social and legal complexities, it is recommended to pilot the plan in a smaller block or cadastral parcel with more unified ownership or higher social readiness. This will establish a successful model for the entire area and reduce project risk.
5. Integration with Other Sustainable Development Tools: Merging LR with approaches like Transit-Oriented Development (TOD) and the 15-Minute City concept to ensure pedestrian access to basic services within 400 to if 600 meters, thereby multiplying the spatial and economic efficiency of the area.
6. Continuous Monitoring and Evaluation: Developing a monitoring system based on quantitative sustainability indicators (e.g., green space per capita, street permeability coefficient, and resident satisfaction) during and after project execution to course-correct if deviations occur.
7. Leveraging Emerging Technologies: Maximizing the use of Geographic Information Systems (GIS) and Space Syntax analyses to precisely monitor physical changes and manage the project intelligently.
This research can serve as a reference model and a scientific starting point for applying the Land Readjustment technique in other deteriorated fabrics of mid-sized Iranian cities, taking into account local, legal, and economic considerations.

Funding
There is no funding support.

Authors’ Contribution
Authors contributed equally to the conceptualization and writing of the article. All of the authors approved thecontent of the manuscript and agreed on all aspects of the work declaration of competing interest none.

Conflict of Interest
Authors declared no conflict of interest.

Acknowledgments
We are grateful to all the scientific consultants of this paper.