When you need to express proximity or physical closeness, there are several phrases you can use instead of "close up to". Some synonyms for this phrase include "nearby", "adjacent to", "beside", "next to", "nearly touching" or simply "close". Similarly, you can use phrases like "in close proximity", "within earshot", "within reach" or "within striking distance" to describe objects or people that are physically near each other. These synonyms can be particularly useful when writing about architecture, photography, or any activity that involves being in close contact with something or someone.