From the trees you've described, they would be unlikely to grow in the same way as earth trees. It could very well be possible that they have a much greater width:height ratio.
If they are getting moisture/nutrients all the way up the trunk, they could grow outwards much quicker, so having trees that are so tall that inhabitants part-way up could not see the ground/canopy would mean they might have the circumference of a city.
In terms of any development of a society, if you think of each tree as the residence of a single town/tribe, they would have either have had to be self-sustaining or have found a way to go from tree to tree.
To be self-sustaining, the tree must provide everything people need, such as food, shelter and water. Water could be taken directly from the tree, and the tree might well grow fruit directly from its trunk (particularly if this is where it is getting nutrients/water from), that the people could eat. This might mean them having to be sustainable, or making climbing equipment to go quite far up or down the trunk from where they live.
As for where they live, they would either have to build upon an existing branch, or hollow out the tree and carve out some accommodation inside. It is likely, however, that if the trees continue to grow rapidly, any inside accommodation would also change over time, and would need to be constantly maintained without ruining the structural integrity of the tree holding itself up.
Each tree of such a size would be very far from other trees, as they would compete too much for resources, so reaching other trees would be difficult. Humans living in trees would eventually try to discover others, as it is human nature to explore, so they would have found a way to do it.
One way could be to travel out to the farthest stable point of a branch (which would be very long and sturdy if they obtain nutrients in the same way as the core of the tree), then create a swing from the trunk to the far point, and swing out to get to the furthest point possible. They may be able to reach another lower branch via this method, and then build a bridge back across.
If they have the materials to create bows & arrows, they could also shoot across to another tree and climb over, as long as the person is light enough and the arrow is properly anchored into another tree.
So cities might reside within the interior of a tree, with plenty of pillars to make sure the tree can still hold itself up, possibly full rings in concentric circles, with richer people living closer to the centre. Then as the tree grows more people can live inside each tree.
This would mean connections between trees would be like roads connecting different cities.
If the branches are sufficiently thick, people could also live on these branches, constructing homes on them from the wood used to hollow out the tree.