diff --git a/python_3_oop/chapter03/real_estate.py b/python_3_oop/chapter03/real_estate.py
new file mode 100644
index 0000000..dcf3419
--- /dev/null
+++ b/python_3_oop/chapter03/real_estate.py
@@ -0,0 +1,67 @@
+# python 3 oop - chapter 3 case study
+# simple real estate application
+
+
+class Property:
+
+    def __init__(self, square_feet='', beds='', baths='', **kwargs):
+        super().__init__(**kwargs)
+        self.square_feet = square_feet
+        self.num_bedrooms = beds
+        self.num_baths = baths
+
+    def display(self):
+        print("PROPERTY DETAILS")
+        print("================")
+        print("square footage: {}".format(self.square_feet))
+        print("bedrooms: {}".format(self.num_bedrooms))
+        print("bathrooms: {}".format(self.num_baths))
+        print()
+
+    @staticmethod  # decorator form of the staticmethod constructor function
+    def prompt_init():
+        return dict(square_feet=input("Enter the square feet: "),
+                    beds=input("Enter number of bedrooms: "),
+                    baths=input("Enter number of baths: "))
+
+    #prompt_init = staticmethod(prompt_init)
+
+
+class Apartment(Property):
+
+    # class variables
+    valid_laundries = ("coin", "ensuite", "none")
+    valid_balconies = ("yes", "no", "solarium")
+
+    def __init__(self, balcony="", laundry="", **kwargs):
+        super().__init__(**kwargs)
+        self.balcony = balcony
+        self.laundry = laundry
+
+    def display(self):
+        super().display()
+        print("APARTMENT DETAILS")
+        print("laundry: %s" % self.laundry)
+        print("has balcony: %s" % self.balcony)
+
+    @staticmethod
+    def prompt_init():
+        parent_init = Property.prompt_init()
+        laundry = get_valid_input("What laundry facilities does the property"
+            "have?", Apartment.valid_laundries)
+        balcony = get_valid_input("Does the property have a balcony?",
+            Apartment.valid_balconies)
+        parent_init.update({
+            "laundry" : laundry,
+            "balcony" : balcony
+        })
+        return parent_init
+
+
+
+def get_valid_input(input_string, valid_options):
+    input_string += " ({}) ".format(", ".join(valid_options))
+    response = ""
+    while response.lower() not in valid_options:
+        response = input(input_string)
+    return response