Final answer:
Post-construction repairs and alterations typically involve structural redesigns such as modifications to the layout or significant updates to the systems within a building.
Step-by-step explanation:
Post-construction repairs and alterations generally refer to structural redesigns that correct issues or implement changes after a building has been constructed. These can include modifications to the structural layout, updates to mechanical systems, or other significant changes that affect the way a building is used or operates. This work is more substantial than routine maintenance tasks, which are regular, ongoing efforts to keep a building in good operating condition, and it is distinct from pre-construction planning and landscaping improvements.