I think that the film industry generally feels it needs to show period settings as "old" to help sell the time and place to audiences, even when the places they show were relatively new by in the era where they're set. There's probably also the issue with trying to deal with real-world historic settings which aren't practical to make "new looking" for historical accuracy. The outside of Kirby Hall is just plain old and they don't have the budget to make the exterior look only 50 years old.
The Bertram family fortune seemed to have its origin in the plantations of Antigua, which probably means that they made their fortune and built Mansfield park within the last 50 years of the film's period era. So it not only wasn't that old, they would have had the money to keep it up.
The forces working against this, though, were just the realities of what level of "decay" people of the era were willing to accept as normal, even among the upper classes. It's not like a can of paint for touching up the walls was down at the home store, nor did they have modern cleaning products, either, so I think things were a bit dingier than we'd expect today.
It could also be that Mansfield was one of those country estates which had been bought as a partial ruin by the newly rich Bertram family, who then embarked on building a new wing to live in with the idea they'd refurbish what was still standing and integrate it later. Then there's also the idea that in an era of candles and lamps that some wing caught fire and just hadn't been rebuilt yet.
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