Help with contracts and economic rents

Compare and contrast the terms contract and economic rents.
Explain the concept of discounted cash flow valuation and income capitalization rates.
Using the internet, try to find at least five commercial properties for sale that would usually be valued with a very heavy weight for the income approach. Determine what type of information on income and expenses is provided. Can you find a web site with sufficient information to use the income related valuation techniques? If so, what is the site’s url?

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