That's a great and surprisingly specific question! In my experience, the most common color you'll see for urban trash cans in business settings like office building lobbies, corporate parks, and commercial districts is a very dark gray, often charcoal or slate, or a classic matte black.
The reason for this is largely about practicality and design cohesion. Dark colors, especially neutrals like gray and black, are excellent at hiding scuffs, scratches, and minor stains that are inevitable in high-traffic areas. They maintain a cleaner appearance for longer with less frequent deep cleaning. From an aesthetic standpoint, these neutral tones are perceived as professional, sleek, and modern. They don't clash with corporate interiors, which often feature metal, glass, and neutral color palettes. A dark trash bin tends to recede visually, blending into the environment rather than becoming an eyesore.
While you might see some stainless steel bins for a high-tech or medical office look, the maintenance (fingerprints, water spots) can be a drawback. Vibrant colors or greens are less common in formal business settings; they are more frequently used in parks, campuses, or to signify specific recycling streams (e.g., blue for paper). So, for the standard, general-use trash receptacle in a professional urban environment, dark gray or black is the overwhelmingly popular choice, striking the best balance between function and subtle, sophisticated form.