Never assume a building (even new) is level, square, or plumb; many are not. Never assume film is resting square and truly flat in your holder; it probably isn't. Never assume little toy levels are truly level; they almost never are - use a pendulum-style angle finder instead. And even with grid markings, the ground glass might not be evenly centered in the back. A full-featured monorail camera makes life easier; I did most of my architectural shooting with a Sinar. Shift can be dicey with most flatbed cameras. But things tend to get intuitive and easy with practice. If you can back off from the subject and use a longer lens, do it; there will be less risk of distortion than using a wide-angle lens.
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