mortgage tax

[Danny Shore]

I am looking at a Mortgage document in NYC's ACRIS system and noticed that NYS taxes the mortgage amount. This is what it states:

Taxes
County (basic): $xxxxx
City (additional): $xxxxx
Spec (additional): $xxxxx
TASF: $xxxxx
MTA: $xxxxx
NYCTA: $xxxxx
Additional MRT: $xxxxx
Total

What is the logic in taxing this one time transaction? In other Mortgage documents, I see that if there is no mortgage taken out, there is none of the taxes above.