It midnight here, so here's a very quick and dirty info dump.

Full list of lot types (0-4 are technical types), and highway, rail and fortification are placeholders.

const static lotType_t LOT_UNOCCUPIABLE = 0;

const static lotType_t LOT_OCCUPIED_N = 1;
const static lotType_t LOT_OCCUPIED_S = 2;
const static lotType_t LOT_OCCUPIED_E = 3;
const static lotType_t LOT_OCCUPIED_W = 4;

const static lotType_t LOT_VACANT = 5;

const static lotType_t LOT_BASE = 6;
const static lotType_t LOT_PARK = 7;
const static lotType_t LOT_SPECIAL = 8;
const static lotType_t LOT_SERVER_SPAWN = 9;

const static lotType_t LOT_ROAD = 10;
const static lotType_t LOT_HILLS = 11;
const static lotType_t LOT_SEA = 12;
const static lotType_t LOT_HIGHWAY = 13;
const static lotType_t LOT_RAIL = 14;
const static lotType_t LOT_MOB_BASE = 15;

const static lotType_t LOT_HOUSE = 16;
const static lotType_t LOT_COMMERCE = 17;
const static lotType_t LOT_OFFICE = 18;
const static lotType_t LOT_INDUSTRY = 19;

const static lotType_t LOT_ZONED_RES = 20;
const static lotType_t LOT_ZONED_COM = 21;
const static lotType_t LOT_ZONED_OFF = 22;
const static lotType_t LOT_ZONED_IND = 23;

const static lotType_t LOT_FORTIFICATION = 23;

Full list of zones:
const static int ZONE_TYPE_CUSTOM = 0;
const static int ZONE_TYPE_SHOP = 1;
const static int ZONE_TYPE_TRESSPASS = 2;
const static int ZONE_TYPE_LOOTSPAWNING = 3;
const static int ZONE_TYPE_CARPARK = 4;
const static int ZONE_TYPE_GARAGE = 5;
const static int ZONE_TYPE_HELIPAD = 6;
const static int ZONE_TYPE_BANK_VAULT = 7;
const static int ZONE_TYPE_SECURITY = 8;
const static int ZONE_TYPE_AMBULANCE = 9;
const static int ZONE_TYPE_TROLLEY = 10;
const static int ZONE_TYPE_SOCCER = 11;

Of these,
ZONE_TYPE_SHOP spawns shop NPCs
ZONE_TYPE_TRESSPASS, when entered triggers the "tresspass" crime and places loot in chests depending on the building type
ZONE_TYPE_HELIPAD spawns helicopters
ZONE_TYPE_BANK_VAULT is similar to TRESSPASS
ZONE_TYPE_SECURITY spawns CDF Guards
ZONE_TYPE_AMBULANCE spawns an ambulance
ZONE_TYPE_TROLLEY spawns a trolley
ZONE_TYPE_SOCCER spawns a giant soccer ball
The rest are placeholders

The tags for zones are the same as above but minus the ZONE_TYPE

See scripts/server/lot_zones/ for implementation details. There is a separate file for each zone.

Voxel Turf\lots\packs\vanilla.txt
But there's town buildings only, decorations and fortifications included. No special.

Still need something about mobbase fort, that with undergrounds.
Ah, theres strings in zerostart_generation:
LC:loadLot (lx, lz, 10-6, "mobbases/mobfort", dir[math.random(1,#dir)], turf.Lot.LOT_FILL_MODE_NORMAL);

and in get_footprints:
--yOffset (optional) = force the lot(s) to be moved vertically the specified amount in blocks (metres)
FP_POOL[#FP_POOL+1] = { xs=3, zs=2, maxcount= 1, count=0, lpis={}, lotTypes = {}, mobbase = { "mobfort" }, yOffset = -6 } -- For big bandit base

Yeah, there's -6 blocks into ground.
Hm, can't add this to normal lots someway... Can just import this on needful level.