not showing proprietors contact details

Their details are a section of the property page.

It sounds like you need part of a page protected, rather than the whole page. If so, you need to use a shortcode such as this:

[s2If is_user_logged_in()]
    Content for anyone that is logged in, regardless of their membership Level.
[/s2If]

Full details about shortcodes, including ones that work according to membership level, can be found at s2member -> API/Scripting -> Simple/Shortcode Conditionals

Yes indeed this is what I mean.
If I understand well I should write the shortcode in the righ hand side box of the property page where it says:

Require Custom Capabilities?
________________________________________
* see: API Scripting → Custom Capabilities

But how do I specifiy owner’s contact details part of the page? Should I write:
[s2If is_user_logged_in()]
owners
[/s2If]

???
thank you!!!!

Such shortcodes go in the main text of the page, and enclose the content you want to protect, just like both you and I have done here.

You should not use the Require Custom Capabilities box: that will protect the whole page.