Pride Houses have been delivered in areas where there are no existing LGBTI centres, and where there is little organised LGBTI community infrastructure.
An existing centre could provide a venue (such as at Vancouver + Whistler 2010) or a structured organisation could be the delivery parent of Pride House (such as at Toronto 2015), but it could also be delivered by sports groups or organisations (such as at Glasgow 2014) or by groups of community activists (as happened in Poland + Ukraine 2012). It is important to establish your model of leadership and delivery, but there are no fixed parameters as to what these should be.