Elon Musk said DOGE “should definitely” investigate after The Post’s exposé of the Fed’s $2.5 billion revamp of its Washington, DC, headquarters — a lavish project that the Tesla titan called an “eyebrow raiser.” The Post exclusively reported earlier this week how the Fed’s top brass were pushing ahead with the pricey renovations despite mounting losses on its balance sheet, catching the eye of President Trump’s austerity axman-in-chief. “Since at the end of the day, this is all taxpayer money, I think we certainly — we should definitely — look to see if indeed the Federal Reserve is spending two...