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Not required to post anything, doesn't likely require neighborhood review unless it's a zoning variance or CHAP district, and may not be required to have plans per se but they need a building permit. You can check the existing permits site and see if they have a permit; if they don't you can file a 311 for unpermitted work and get an inspection on the property. This ensures work is done to code, safely for neighboring propeties, and that it's reflected in the tax assessments.

In my neighborhood (Canton), third floor additions that are under 35 feet overall and set back from the front facade do not go through special zoning hearings. It wasn’t always this way—when I first moved here you saw zoning notices for hearings on these, but they are not required now.

FYI you can find out how your neighborhood is zoned and figure out the regs here:

https://planning.baltimorecity.gov/zoning-code-quick-guide

Also useful: https://planning.baltimorecity.gov/sites/default/files/TransForm%20Design%20Manual-%20Final%20_2019%20Update%20-%20No%20Mayor%20Name.pdf

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No. It just looks stupid.