The cover image says it all: the exploitation of women in a novel only a male author could have got so wrong.
Silverberg was in his mid-thirties when he wrote this 1971 novel, two years before the World Trade Center was opened. It's interesting to speculate about whether those massive towers influenced his writing at all. The novel is set in 2381, and it posits a dystopian future where, in order to accommodate Earth's burgeoning population and provide food for everyone, massively tall towers have been erected, each containing a thousand floors, thereby leaving the land free for cultivation. The logic behind this rather escapes me, and the fact that everyone seems to be in complete compliance with it simply isn't credible. You'd think someone writing immediately after the close of the rebellious sixties might have thought about that!
Within these absurd accommodations, there is a set of "Urbmons" consisting of 25 self-contained "cities" of 40 floors each. People, we're supposed to believe, live in this confinement without ever leaving their 'city', much less leaving the building. I found that hard to credit, people being who they are. Everyone was supposed to be contented, but clearly they were not. I don't see how they could be, given that they were essentially being treated like cattle.
The other main characteristic was the complete lack of exclusive relationships. People got married at an early age (mid-teens!), but all the marriages were open, which begged the question as to what was the point of marriage in this society? I suppose it gave a stable platform for raising kids, but people were not allowed to have kids willy-nilly. Well, maybe nilly, but certainly not willy: they had to be approved, but having large families was paradoxically encouraged in this crowded world! And no one saw a contradiction in this!
Once the kids were there, it seemed like it was the female job to stay at home and take care of them. Guys were out working, so there was a real fifties vibe to this, rather than a 23rd century vibe. Guys would routinely wander the halls and floors at night, and stroll into any apartment they chose (doors had no locks on them), whereupon the woman was expected to accommodate them sexually even if her own husband was lying in the bed right next to them. The women didn't ever seem to roam, although it seems that they were technically allowed to do so.
Everyone seemed fine with this arrangement and it was, we're told, fostered to relieve tensions and avoid violence in this world. I found it hard to believe that there were no couples who wanted to enjoy an exclusive relationship, and who resented that any guy could bed any woman whenever he wanted. It sounded to me more like a male writer's fantasy world than ever it did a realistic projection of human society into the future. The problem was that anyone who exhibited any sort of rebellion or dissension from these arrangements was tossed down a chute to become generator fuel - and no one seemed to have a problem with that either!
Even if I'd been willing to accept all of this at face value, which I really was not, there was still the problem of the story being boring. There were several stories told, each about a guy, but these guys were (and predictably so in a society like this) indistinguishable from one another. One story even featured a woman, but she was also indistinguishable from the guys! Even when one of the guys snuck out of the building into the agricultural world outside, the story didn't improve any. It was at that point that I DNF'd this. I cannot recommend it. It was an exercise in adolescent fantasy as pointless as it was fatuous far as I could see.