Dutch Billies were a distinctive form of urban housing that arrived in Ireland largely through the influence of Dutch and Flemish craftsmen and settlers in the late seventeenth and early eighteenth centuries. They are characterised by their tall, curved or stepped gable ends facing the street, a form that made efficient use of narrow plots while allowing good light into the upper floors. At their peak they gave Dublin streets a markedly continental appearance, but successive waves of rebuilding, modernisation, and neglect reduced their numbers dramatically. What makes number 91 particularly interesting is not the exterior as it currently presents, but what lies behind and above it. Architectural historian Colm Murray noted in February 1998 that the building probably retains a cruciform roof structure, a distinctive internal arrangement associated with the Dutch Billy form. A cruciform roof, in this context, refers to two roof ridges crossing at right angles, creating a cross-shaped plan at ceiling level, a configuration that allowed the peculiar gabled fronts of these houses to function and drain properly. Murray's attribution was made on the basis of personal communication rather than a published survey, which leaves a small degree of uncertainty, but the observation is considered credible enough to warrant the building's inclusion in the record.

Lower Camden Street runs south from the junction at Wexford Street and is a busy, well-worn stretch of the city, lined with shopfronts and residential conversions that rarely invite a second glance. Number 91 sits within this context, and there is nothing about the current facade that announces its possible antiquity. Anyone curious to look should do so from the footpath and consider the roofline and proportions rather than the ground-floor frontage, which has been altered like so many others. Access is obviously limited to the exterior, and the cruciform roof structure, if it survives intact, would only be visible from within. The building is not listed as a visitor site of any kind; its interest lies in what it might preserve quietly above the heads of those who pass through it every day.