"- gra mm atically acceptable? Yes. You can join together as many possessives as you want.
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Anonymous Are the phrases: "the president's office's name is.../ the president's house's name is..."- grammatically acceptable?Yes. You can join together as many possessives as you want.
Anonymous it is often said that we shouldn't use " 's" with thingsThat's good practical advice. My comments pertained only to sequential 's.