There currently isn't a way for a crew to share property. You could all give money to one person to own an apartment you could all go to assuming that person was online. There is no practical way to share a garage as any vehicle driven into a garage becomes a personal vehicle of the owner and they can only have one personal vehicle out at a time.

There are two ways to see the whole Hierarchy of your crew via the Rockstar social club, View your hierarchy and Manage your hierarchy.

To view the hierarchy of your crew:

1) Login to the Rockstar Social Club here

2) Click on the Crews link

3) Click on the crew's title that you want to view the hierarchy of (you can be in multiple crews, but only one can be active at a time). The text will turn a different color when you mouse over it. Note: I have painted over our crew as I am not looking to advertise in this answer (PM me if you would like to join).

4) Click on Hierarchy

5) View your awesome hierarchy!

To manage your crew:

1) After clicking the crews link (#1 already shown above), click on Manage Crew. Either link shown in the picture will work.

2) Click on the Hierarchy tab, and manage your crew!

If you are interested in the actual rank titles your Crew leader specifies, you can view that under manage (if you have the previlage to do so) and at the bottom of the page. Ours looks like this: