Something that I always recommend that my clients consider, is a logos use in social media. Most Realtor's are very strong in their facebook and twitter presence. The circular versions have to be reduced a great deal to fit inside of the square icon shape of social media, leaving a lot of empty space in the corners of the icons. The square version can be kept much larger as it fits perfectly into the full space.
This is also a good rule for signage as well.
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