Strobist has an interesting article by architectural photographer Mike Kelley. Usually exterior shots of homes and buildings are simply too large to effectively light with speedlights or big power packs. The tried and true method of capturing a great looking exterior shot is to turn all the lights on in the building and wait for the ambient sky light to match the build's artificial light. In the behind the scenes video below, Kelley shares his "selective lighting" technique and how it can be combined with multiple exposures from a small Canon 430EX to produce a sort of hero shot for publication. After watching the video, check out the before and after photos below.
Final Before and After Photos: