Please forgive me in advance for my lack of knowledge in this area. 

I am seeking the helpful advice of someone more network savvy than myself.

So the problem I am facing is this:
I have shifted into what used to be a home office building (5+ years ago with previous landlords), which certainly had internet to it. This has 20+ ethernet/telephone? ports in the walls, however no connectivity. I believe the landlord has a VDSL internet connection however the building I am in is too far for wifi (something I'm working on seperately).

Digging deeper I find that where a switch once would have been has been totally ripped out by the previous owners, see below:

https://imgur.com/a/hbDJXx2

Above this switch is an alarm system box. 

I have access to a 24 plug unmanaged switch, but obviously, there is no way to connect anything as the cords from the previous unit have been broken and taped off it seems. 

Any advice on where to start with a solution would be much appreciated, I am calling spark this arvo to see if they have a record of what has happened. 

I'm pretty keen to find a solution myself and not afraid of getting my hands dirty to fix it, so any starting point would be super helpful :)

Thank you!