I am afraid that you have misunderstood. I was not referring at all to was what originally named the 3Ts development (now the Louisa Martindale building) that you quote.
I was referring to the original plans for the existing tower block at RSCH (the one that has recently had a helideck added...
...and the original plans for when they started to expand the RSCH beyond the original buildings (facing onto Eastern Road), was for 3 inter-linked tower blocks. Presumably central government pulled the cash, so we ended up with just the one.