If the house is on a concrete slab (as in Oklahoma/Texas), I would not install anything for flooring, and instead look into getting the concrete floor stained/epoxy coated.My next option is porcelain tile using a modern rectangular tile instead of square.

I don't want to ruin the entire place, I just want to remove the shelves safely without harming the surrounding stuff.The mirror is huge and it is in a rectangular shape, I would like to resize it (preferably reshape).

In terms of the actually shingles themselves, if you start to see a lot of them deteriorating, as in the don't fully look rectangular anymore, or they are covered in moss of leaves from a tree above it usually means the roof is toward the ends of its life (<5 years of use).

The building is a large rectangular brick building.

The thought would be to do mini storage as it’s in an urban setting.It’s a flat rectangular lot with services on the lot, but it would be a blank slate.

As mentioned, I'd take a look at a rectangular floor tile.

it's a long rectangular structure about 75 feet by 10 that doesn't have any windows in it.

But if i were to do this it leaves the bedroom area in a very rectangular shape, roughly 20x8.

Look for simple designs: square or rectangular footprint, 2 story, moderately pitched roof, bathrooms in close proximity to each other for reduced plumbing costs.Drive by one of the big nationwide builders and look at their house designs, lots of 2 story boxes with simple roof lines.The only new construction project I've been a part of consisted of a Victorian house with round rooms and roof lines.

I imagine that excavating just under the porch or one of those rooms will be a good bit more expensive due to the non-rectangular design (foundation and framing will cost more) and excavating a larger rectangle (under the Pantry, Porch, Mom Room) will be more expensive because it's just more excavation, foundation and framing.