The Investment method can be applied to determine the market value of a freehold or leasehold interest in property from its potential to generate future income. It is typically used for the main forms of properties where a tenant is providing the landlord with an investment return on his capital cost (purchasing the building). Using this method, the comparable property transactions of sales and lettings are analysed to find the revenue. The profit is thereafter applied to the future rental income, which is discounted back to the present day giving the net present value (NPV). This is finally used as an indicator of how much the building is presently worth.