The map tile properties will be compressed at:

$7E7600-$7E76FF tile properties byte 1
                special values: $F7 = always impassable, $07 = counter tile, can be talked over
                lrdbtslu
                l: Tile uses up/left movement (stairs)
                r: Tile uses up/right movement (stairs)
                d: Door Tile
                b: Bottom sprite shown above priority 1 bg (not active for bridge tiles, ZoneDoctor: "0.4")
                t: Top sprite shown above priority 1 bg (not active for bridge tiles, ZoneDoctor: "0.3")
                s: Bridge tile (ZoneDoctor: "solid tile, cannot be walked on")
                l: Passable on lower z-level (ZoneDoctor: "Solid to tier 2")
                u: Passable on upper z-level (ZoneDoctor: "Solid to tier 1")
                note: if l & u are both set, this tile can be a transition between upper and lower z-level

$7E7700-$7E77FF tile properties byte 2
                nu--btrl
                n: NPC can randomly move here (ZoneDoctor: "Passable quadrants")
                u: Always Face Up (ladder)
                -: (ZoneDoctor: "1.5")
                -: (ZoneDoctor: "1.4")
                b: Passable through bottom
                t: Passable through top
                r: Passable through right
                l: Passable through left