I’m not suggesting this at all, just winging it with the various info you’ve gathered ... but, could there have been an intent for Stanley Ann Dunham’s baby to be privately adopted? Two adopted children at this address.
I honestly think the grandmother had a hand in the birth announcement, and went for a showy address out of vanity, myself. Trying to impress her banker coworkers or something. The announcement also said in no uncertain terms that they were married, when the reality seems to be a little vague.
I thought of the adoption angle myself but the birth announcement negates that. I also thought perhaps the Lefforge family moved into the home at the end of August which would mean that the home may have been in the closing process but would provide a safe address for the registration of birth and birth announcement. Madelyn Dunham was the mortgage dept at the bank! I don’t think the registration and birth announcement were placed with a thought to a run for the presidency but simply to preserve the honor of the daughter and to provide a cover story of legitimacy for the child who would sooner or later begin to ask questions. I have not yet received any word from UH as to when Orland Lefforge returned to teach at UH after his stint there in the late 40’s.
Madelyn’s co-workers did not know she was a grandmother until Jr showed up there in the 70’s. Grandpa was the driving force behind Jr being accepted at Punahou and he took Jr to Punahou for the entrance exams in 1970 and he also accompanied Jr to Punahou on his first day of classes in 1971.
As usual, there is better research being done here on Free Republic than the news sites.