Here are two pro-looking design concepts (#134, #135), with more unique approach, regarding the symbols used in it. I've tried to avoid overused/generic representation of buildings, because they are all over the place and very hard to copyright/trademark protect it.
Hope you'll like the concept and feel free to suggest improvements (colors, layout, fonts, etc.) Thank you!
...obviously, pen as a symbol of signing agreement, concluding agreement/dispute/case,...something that says "legal", but without obvious and overused symbols, like scales of justice, wooden hammer, ionic pillars, corporate buildings and such symbols,...just an additional explanation of story behind this design! Cheers!