sagging kitchen floor

I’m in the garden level apartment of a five story brownstone in Carroll Gardens.

Over the past few years, I’ve noticed a sag in the kitchen floor that is getting progressively worse. The sag occurs in two places: both a few feet in from two entrances on opposite sides of the room. The center area seems to be holding firm. The kitchen measures approximately 14′ X 10′

Currently, there are Armstrong vinyl tiles on the floor which have shifted and tore over the years. I want to level the floors and have them re-done. We’ve had both termite issues (abated, supposedly) and water issues (next door neighbor). The
kitchen is situated above the boiler room but not directly over the boiler.

My concern is opening the kitchen floor and discovering something more involved than a century-old sagging sub floor. I’m looking for advice/recommendations as to whether I should go with a GC with both floor and structure chops or go with experienced floor guys, let them tear away and hope for the best.

Thanks.

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