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If you are playing a "cities match" you might (and indeed should) have more detailed house rules for moving into, out and in buildings.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799432.page http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799432.page GMT
You are free to have particularly large buildings be divided into sections, each acting as a seperate building from a rules standpoint.

As far as moving from building to building(section to section) it takes all of your movement to do so.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799639.page http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799639.page GMT 40k, the Rules forum is here. http://www.dakkadakka.com/dakkaforum/forums/show/15.page (40K You Make Da Call)]]> http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799708.page http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799708.page GMT 40k rule book clearly says what you do with buildings/ruins. Buildings are Transport vehicles, see the Transport rules section, and ruins are 3" for each vertical level.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799786.page http://www.dakkadakka.com/dakkaforum/posts/preList/423645/3799786.page GMT