Straighten Architectural Verticals

Give me a correction plan for a building photo where the verticals lean. PHOTO What it is: [EXTERIOR | INTERIOR] Lens feel: [WIDE | NORMAL] What must stay true: the building's actual proportions, windows that are rectangular, the horizon if it is in frame. What I may crop: [HOW MUCH] STEPS 1) Decide whether this is perspective correction or a tilt I should have fixed in camera. If the lean is extreme, say what will stretch. 2) The order: crop loosely, correct verticals, then horizontals, then a second crop. Name the tool (transform, guided upright) without pretending one slider is magic. 3) What warps and how to check: circles that became eggs, people at the edges, a sign that changed shape. People at the edges may need a separate mask. 4) Interior version: verticals straight, but do not "correct" a stair into a ladder. 5) Export and the before/after at the same crop for the client. Do not invent a floor or a roof that was outside the frame.