Can't be done, and here's why: the 0.25% rate he's referring to is the federal funds rate, which is the rate banks borrow/loan money from/to each other. You don't just "borrow from the Fed". Most loans between banks are very short-lived, for example a bank might want to loan money to a major company but doesn't want to wait days or weeks until it has enough in reserves, so it loans the money from another bank. Because the loans are very short-lived and are usually between established banks, they're also very cheap compared to the loans offered to the public. The interest rates of the loans are also negotiated between banks. Now, when you take the fact that, in this case, the borrower would be a complete unknown, and especially the fact that this loan would be for a much longer period than what is usual, 0.25% is impossible. Hell, you could be the Goldman Sachs and be lucky to get under 5% for a 30-year loan.
(TL;DR: can't loan that much money with a rate that low for 30 years)
(TL;DR: can't loan that much money with a rate that low for 30 years)