Not all stocks are at all-time highs. Here are three excellent businesses trading for a discount right now. The S&P 500 is near its all-time high, but not all stocks are doing so well. That's especially the case in the real estate sector, where some of the highest-quality real estate investment trusts, or REITs, are trading for 20% or more below their all-time highs. With that in mind, here are three excellent REITs, all of which are S&P 500 components, that are worth a closer look while they're on sale. Bu ...