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No, your husband does not have to leave the building to his friend. It is a promise but it is not a binding contract by any means.
However, when your husband and the friend purchased the building, did they buy it as tenants in common (I hope so) or as joint tenants (I hope not).
If they bought it as joint tenants the friend may get the building upon your husband's death - you need to talk with a real estate attorney.
Otherwise, your husband can leave the building to anyone he wants.
Best of luck to you.
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