If architectural heritage in cities is recognisable for the masses, it does not raise doubts as to its value. However, if the architecture is controversial, relatively young, or can be associated with a problematic legacy and difficult past, its valuation raises ambiguities. Unconventional valuation methods can help resolve these uncertainties, making it easier for local decision-makers to make sounder decisions. This paper presents a proposal for valuing Warsaw’s modernist WKD Ochota train station, using a combination of cost-benefit analysis and a Delphi panel. The study carried out for the purposes of this article revealed that such architecture, although ambiguous, is treated by the local community as valuable not only in economic terms, but also in social and cultural terms.