Urban structures is an expansion pack for flash point fire rescue it is initially printed in low quantities in 2011 for supporters of the kickstarter project for the base game subsequently it is also available for pre order from the publishers indie boards and cards urban structures contains 1 double sided mounted game board 1 structural engineer specialist card and additional map specific rules with variants and scenarios age range 10 and up number of players 1 to 6 play time 45 minutes