2026 Theses Master's

Architecting Affordability: A Comparative Study of Social Housing Delivery in New York City and Vienna

Schwartz, Ben

New York City, like many cities across the world, faces a growing crisis of housing affordability. Constructing new, rent-regulated housing is perhaps the most direct means of addressing the needs of residents squeezed by rising costs. While New York City leads among American cities in affordable housing construction, Vienna is most often held up as the global model for social housing. This raises the question of whether elements of Vienna’s policy and funding framework can improve New York City's delivery of new affordable units.

This thesis addresses a gap in scholarly research on the mechanics of affordable housing development through case studies of six recently completed projects (three in each city) and semi-structured interviews with nine development professionals. The findings reveal that while extended development timelines are common to both cities, per-unit costs diverge dramatically: $697,408 in New York versus $195,586 in Vienna (2026 inflation-adjusted dollars), after controlling for land costs. This thesis argues that this gap is driven by structural differences in each city's housing regime. Vienna’s unitary system produces simplified financing, inflation-indexed rents, and pre-leased buildings occupied upon completion. New York’s dualist regime treats affordable housing as a scarce, targeted benefit, imposing layered compliance requirements, fragmented funding, and an allocation process that delays occupancy and inflates costs.

The conclusion identifies potential reforms to improve new affordable housing delivery in New York, including replacing the housing lottery with a pre-qualified applicant registry, consolidating government reviews and subsidies, and indexing rents to inflation. It also considers more fundamental changes, aligning New York's regime with Vienna's unitary model.