The timing is weird just one hour before the intervention of SHN.
Nevertheless Israel is very likely behind the explosion in the port. The nitrate ammonium were brought to Beirut port in a so complex operation, that it couldn't be the work of 3okab Saqr or the Munshar intelligence services of Sudi Arabia.
It is a dilapidated building. There is really nothing there. You can go there by yourself this night. You can even peep into the building through the fence. I have relatives who live in Jnah. And this isnt the only dilapidated building. Some are used by mechanics as garage to repair vehicles.
It looks like Netanyahu's Lebanese informants are doing a bad job to get paid.