Agent won't show occupied unit for sale?

[Sarah Metzger]

Hey all! I'm looking to buy my first property - a duplex. The back has been renovated and has pictures posted but there are no pictures of the front unit which has not been renovated due to it being occupied. 

I'm set to go see the property tomorrow but the agent just informed me that we cannot see the front unit because it's occupied.. Is this normal? 

His response as to when we could see the front unit was, "Only showing after under contract" Seems crazy to me to even consider buying a property without being able to see it. 

Thoughts? Advice? Is this normal?