Just as an aside, you could have built the project full size. InDesign has an 216 in limit per page but can do up to 10 page spreads, so InDesign could create a 180 ft x 18 ft spread. When you output, just make sure it outputs as spreads, not pages. As far as resolution goes, if you do work a 1/3 size, your images need to be 3 times the resolution requested by the print service. So if they asked for 300 ppi final resolution, your images need to be 900 (as was mentioned); if they asked for 150 ppi final res, yours need to be 450. What is the print service asking for? When I have done banners, my vendor wanted the entire file as raster, including any text or vector art.
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