It's not long-term strength, by the way. The US economy[1] is in shambles, and ready to implode any moment. What you're seeing in the real estate market is a new bubble. The buyers are investors, and the current craze started when people thought the bottom was in. The zero-interest rate policy "helps" too.
Just thought you might want to know. Be careful.
[1] Not only the US, but pretty much all Western economies (+Japan) are ready to implode.