Pre-code reinforced-concrete residential blocks from the 1950s–1970s represent a large share of the existing housing stock in southern Europe and present well-documented seismic deficiencies due to limited ductility, irregular configurations and the absence of lateral-resisting systems [1]. In Spain, social-housing districts built during this period frequently include H-shaped blocks characterised by stiffness discontinuities, short-column effects and [GU2.1]low transverse strength, which have been associated with significant seismic vulnerability in recent studies [2]. Despite growing interest in large-scale vulnerability assessment methods, the link between macroseismic evaluation and detailed numerical modelling remains insufficiently explored, limiting the reliability of city-scale risk estimates and the development of scalable retrofit strategies. This study addresses this gap by proposing a multidisciplinary framework that integrates (i) macro-typological characterisation of a 1960s district using urban data and mechanical proxies, (ii) macroseismic vulnerability assessment following RISK UE principles [3], (iii) detailed architectural and structural characterisation of a representative H-shaped block using archival plans and in-situ inspection, and (iv) finite-element modelling to identify failure modes, modal properties and expected damage patterns. Results reveal a strong correspondence between macroseismic and numerical damage state predictions, supporting the validity of the urban-scale assessment while clarifying the role of aprioristic weaknesses (particularly short columns and the lack of a lateral system in one principal direction) in governing seismic response. The study demonstrates the feasibility and sustainability benefits of preventive intervention in pre-code social-housing typologies and provides a transferable methodology for similar districts across southern Europe.