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Slab with Concrete Blocks

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Trying to figure out a concrete slab system built around 50 years ago. I can see 
concrete blocks hanging on something made of steel (beams, covered with concrete 
casing) one CMU o.c. Either they are really hanging (being supported by the steel beam 
covered with cement concrete or simply they are there because of the concrete bond 
only. It could be W section or something that I can't figure out. Need to notch the 
section. At a couple of places I could see removed concrete casing and could clearly 
see rusted steel, the steel section looked hollow to me, and at many places the blocks 
have fallen and some of them are in progress of falling down.

I have pictures of the slab. The blocks have started falling down slowly and gradually. I 
can see the deflection in the slab clearly. People, residents of the apartment complex 
have their car parking space under the slab, and walkway + entrance of the apartments 
over the slab. Looks, 25+ or - total span of the beam w/ around 30 + or - beams. 
Couldn't figure out the total thickness of the slab. Must be more than a block height. 
Town building inspector has asked for the structural inspection and approval from a PE 
if this is still safe with this remedy.

Any thoughts ?

Much thanks for your time.

Shival Tailor

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