A road looping through a large apartment complex in my town has an unusual numbering system that assigns a unique house number to each apartment. The first one or two digits indicate the building number; the next, hundreds, digit, one of up to four entrances to that building; the tens digit, the floor; and the final digit, the apartment on that floor. The highest number on this street, less than a mile long, is 28334. This is a huge house number in New England, where grid address systems are almost nonexistent. Does this system exist anywhere else?
https://www.google.com/maps/place/28334+Town+Walk+Dr,+Hamden,+CT+06518/@41.3931561,-72.9140772,17z/data=!3m1!4b1!4m5!3m4!1s0x89e7da9014e50103:0xf9332231938e547c!8m2!3d41.3931561!4d-72.9115023!5m1!1e1?entry=ttu
I have seen a similar type of numbering for dependent addresses for apartment units, but not as primary address numbers.
Way back when, my old apartment was #211 when I moved in. For some reason, the management company changed the numbering around to #2205 for reasons that are still unclear to me.
This is not unusual, but an apartment complex close to my town has a similar system. There is a few roads, including one that loops around much of the complex. The numbering system is like this:
XXXX: Building number.
XXXX: Floor.
XXXX: Unit number.
The lowest number is 1001, and the highest is in the 155XX range.