| Correct, Harvard doesn't have an undergrad architecture program.
Penn has one but it is a BA, not a professional degree BArch that Cornell has. There is no portfolio to get into Penn. You cannot be an architect after graduating Penn unless you go onto a MArch Program (which Penn also offers, as does Harvard). Cornell, on the other hand, has a BArch or a MArch program, both of which lead to becoming a licensed architect.
When you apply to Harvard or Penn as an undergrad, there is no commitment to a major, nor are you accepted into any arch program. You apply like any other undergrad liberal arts major. At Cornell, you must be accepted in the BArch program. | 
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