diff --git a/docs/Characteristics.md b/docs/Characteristics.md
index c7c7723..caf70e2 100644
--- a/docs/Characteristics.md
+++ b/docs/Characteristics.md
@@ -120,6 +120,7 @@ isUnderRoof | Mainly used for parking slots. | [applicable](#type-applicable)
 isWellTended | Properly looked after. | [applicable](#type-applicable)
 isWheelchairAccessible | All aspects are accessible for wheelchair users. | [applicable](#type-applicable)
 numberOfApartements | Number of apartements contained. | positiveInteger
+numberOfResidentialUnits | Number of residential units contained. Usefull for investment offers. | positiveInteger
 numberOfBathrooms | Number of bathrooms. | positiveInteger
 numberOfFloors | Total amount of floors. | positiveInteger
 numberOfParcels | Number of parcels. | positiveInteger
diff --git a/schema/schema.xsd b/schema/schema.xsd
index 80695a3..8f4ab4f 100644
--- a/schema/schema.xsd
+++ b/schema/schema.xsd
@@ -559,6 +559,11 @@
           <xs:documentation>Number of apartements contained.</xs:documentation>
         </xs:annotation>
       </xs:element>
+      <xs:element name="numberOfResidentialUnits" type="xs:positiveInteger" minOccurs="0" maxOccurs="1">
+        <xs:annotation>
+          <xs:documentation>Number of residential units contained. Usefull for investment offers.</xs:documentation>
+        </xs:annotation>
+      </xs:element>
       <xs:element name="numberOfBathrooms" type="xs:positiveInteger" minOccurs="0" maxOccurs="1">
         <xs:annotation>
           <xs:documentation>Number of bathrooms.</xs:documentation>