MSYapps is a great little suite of apps for finance, real estate and educational purposes. Here are some of my favorites:
The NCREIF Property Index provides quarterly and annual total returns for thousands institutional-grade office, retail, apartment, industrial, and hotel properties. All properties in the NPI have been acquired and managed on behalf of tax-exempt institutional investors, principally pubic and private pension funds. Performance histories began in 1978.
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The NCREIF Transaction-Based Index is estimated from NCREIF Property Index property sales in each quarter. As such, returns are provided for office, retail, apartment, and industrial properties. Additionally, estimated returns are grouped by geographic regions: west, south, midwest, and east. Performance estimates began in 1994. 
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The NCREIF Fund Index is an open-end Diversified Core Equity provides quarterly and annual total returns for 28 institutional open-end commingled real estate funds. All the funds in the ODCE pursue a “core” investment strategy and some have performance histories going back to 1978. The NFI-ODCE is market-weighted and reported both gross and net of fees.
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MSYapps also has several other general financial iOS applications including Quick Present Value, Quick IRR, and a free "Quick Save" app that provides a simple calculator which derives a savings plan based upon a specified interest rate and time period.