Impersonating a user is a great way of seeing what you Residents and Tenants can see on the portal.
1) Select the Building you want
2) Go to Set up > Users
3) Find your user > "Select Action" > Impersonate user
4) WARNING - you will be accessing a live account - anything you do will be logged and applied to the user.
This is limited to admins or (Local PM's in a building).