In Batman we saw the skyscrapers of the business sector, the cathedral and police department and the Axis Chemical plant. We also saw the newspaper office, the art museum, the movie theatre and the seedy area with prostitutes and homeless men.
This was a broad representation of Gotham as a dirty, struggling city, with the best and the worst in full view.
In Batman Returns we saw a very claustrophobic representation, not contradictory, just alternative.
We saw Gotham Plaza mostly; the Shreck department store featured heavily, with the small independant shops around it and the Mayor's office at the end. We also saw Robinson Park, leading on to the abandoned zoo, and the sewers beneath the city. The rooftop moments, and the car chases, all take place in and around the Plaza.
Returns' Gotham doesn't have to be considered as a reimagining, just as a cross-section of one location within the city.
You could even argue that the Schumacher Gotham, within the story of the movies, developed from a 30s/40 style city into a futuristic one as a boast of its advances with power and rebellion against Max Shreck's plans to suck energy with his proposed power plant. He failed, and the city invested in modernisation. It could also be said that his power plant was built, but altered by the Riddler into that power station as seen in Batman Forever.