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Those definitely are not coaster footers. Plumbing related. Hard to say for sure from that distance, but 3 separate grease traps with tall risers are the most likely answer. You can kinda tell the tops are sewer lids. I never looked at them that close until Alicia mentioned grease traps, but I'd say thats what those have to be.
And once you look at the rest of the "footers" leading across the front of the manor to these, you can see they aren't coaster footers either.