I would like to create a glass part of a building (see image), but when I extrude the faces, the edges stay where they are distorting the shape.
Am I doing something wrong? I need to get the faces to move inwards. (using Maya 2017)

Click image for larger version. 

Name:	MayaExtrude03.JPG 
Views:	33 
Size:	98.6 KB 
ID:	74714Click image for larger version. 

Name:	MayaExtrude02.JPG 
Views:	33 
Size:	118.1 KB 
ID:	74713Click image for larger version. 

Name:	MayaExtrude00.JPG 
Views:	34 
Size:	28.9 KB 
ID:	74711Click image for larger version. 

Name:	MayaExtrude01.JPG 
Views:	34 
Size:	101.6 KB 
ID:	74712