A block (which, as you've pointed out is an ephemeral phrase), in NYC at least, is the space along a road from intersection to intersection. It thus usually doesn't count gaps between buildings or alleys or the like. Many of the long (east/west) blocks in Manhattan, for example, have pedestrian pass-throughs in the middle, but that doesn't count as a split in the block.
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A block (which, as you've pointed out is an ephemeral phrase), in NYC at least, is the space along a road from intersection to intersection. It thus usually doesn't count gaps between buildings or alleys or the like. Many of the long (east/west) blocks in Manhattan, for example, have pedestrian pass-throughs in the middle, but that doesn't count as a split in the block.