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Advice on low-risk long-term strategy for extra cash?
Look at a mixture of low-fee index funds, low-fee bond funds, and CDs. The exact allocation has to be tailored to your appetite for risk. If you only want to park the money with essentially no risk of loss then you need FDIC insured products like CDs or a money market account (as opposed to a money market fund which is not FDIC insured). However as others have said, interest rates are awful now.  Since you are in your early 30's, and expect to keep this investment for 10+ years, you can probably tolerate a bit of risk. Also considering speaking to a tax professional to determine the specific tax benefits/drawbacks of one investment strategy (funds and CDs) versus another (e.g. real estate).