Leader lines and terminators can be included on DataGroup Annotations.
In the DataGroup Annotation tool settings you can turn on leaders and select a terminator where appropriate. Go to the Building Designer menu > Annotate Tool Settings, click on the Type shown and alter as required, here it is set to none and can be changed to Leader Line or B-Spline.
The same settings apply to the symbology and terminators for Annotation tools such as Label Coordinate:
*TERM08 can be rotated back to vertical if appropriate.