You may see the amenity=hospital tag on an area alongside a building=yes (or building=hospital tag), where there is a single building outline for the hospital, however the normal approach is draw an area enveloping the hospital grounds and one or more areas with building tags inside this area. It's quite common to have a large hospital campus with multiple buildings. Note that the buildings should not carry the amenity=hospital tag. One feature, one OSM element. One hospital, one area tagged amenity=hospital. This is in line with recommendations for other types of institution such as schools and universities.
Павлоградський генплан 10 років тому був у векторі (.pdf) Потім вони той вектор десь загубили, але в них лишився .jpg розміром 20000х20000 і вагою десь під 50 мегабайт :)