Well, in tenements (typically about 8 flats) there's usually a firm of factors involved. Each owner pays an amount per quarter, and the factor carries out communal repairs, and, for a big repair, such as a roof, they'd get quotes in and arrange the work. The problem is that if one owner refuses to contribute towards a large repair, I don't think the factors can legally make them pay. Years ago, when I lived in a flat, five of us paid more than our share because one person didn't want a door entry system.
In some tenements, where everyone has lived there for ages and knows each other, one person takes charge and they have a communal repair fund.
Generally, factors charge a lot for doing not very much, and I've yet to find anyone who has a good word to say about them.
The buying process is different too - until recently, houses and flats in desirable areas were sold for "offers over". You'd put in a price, and then at a closing date, you'd find out if you'd bid the highest price. It got ridiculous in some parts of Edinburgh and Glasgow, with properties going for more than 25% above the asking price - so, not a great system. But at least there's no gazumping.