Formal:
* Before (e.g., "Please stand before the audience.")
* Ahead of (e.g., "He walked ahead of me.")
* Prior to (e.g., "Prior to the meeting, we need to prepare.")
* In the presence of (e.g., "He spoke in the presence of the Queen.")
Informal:
* Facing (e.g., "He stood facing the window.")
* Opposite (e.g., "They sat opposite each other.")
* Up front (e.g., "The singers were up front.")
* In the lead (e.g., "She's always in the lead.")
More specific:
* Directly in front of (e.g., "The building is directly in front of the park.")
* At the front of (e.g., "He sat at the front of the bus.")
* Ahead of (e.g., "The car ahead of us is going too slow.")
The best choice will depend on the specific situation and the intended meaning.