Based on your description of the architecture as an old abandoned building made of bricks, with unfinished windows, the roles of art that might apply include historical culture representation and static representation, as the architecture could reflect a certain period and style, or convey a sense of place and history.
The roles typically associated with art do not generally include "financial incentive" as a main role. Financial incentive relates more to the commercial aspects of art and architecture rather than its intrinsic artistic roles or purposes. Therefore, in this context, "financial incentive" is not one of the main roles of art.