You are entitled to receive compensation for the value of the part of your property that is taken, plus, you are entitled to receive compensation called “damages” if the property you have left is worth less because of the loss of the part taken.  For example, if you own a restaurant and part of the customer parking lot is taken, you are entitled to payment for the value of the parking lot taken, plus, you are entitled to payment for “damages” to the remaining restaurant property  because of the loss of customer parking spaces.