public void setUnitNumber(String unitNumber) {
        this.unitNumber = unitNumber;
    }
<p>
For addresses with multiple units, the unit identifier. Can include numbers and letters, for example
<code>3B</code> or <code>Unit 123</code>.
</p>
<note>
<p>
Returned only for a place index that uses Esri or Grab as a data provider. Is not returned for
<code>SearchPlaceIndexForPosition</code>.
</p>
</note>

@param unitNumber
       For addresses with multiple units, the unit identifier. Can include numbers and letters, for example
       <code>3B</code> or <code>Unit 123</code>.</p> <note>
       <p>
       Returned only for a place index that uses Esri or Grab as a data provider. Is not returned for
       <code>SearchPlaceIndexForPosition</code>.
       </p>
aws-java-sdk-location/src/main/java/com/amazonaws/services/location/model/Place.java