What is the post code of this property? Title K835532

Unusual property: https://en.wikipedia.org/wiki/Grain_Tower

When you put into Google, it shows the address: "7 Pintail Cl, Isle of Grain, Rochester ME3 0DW" (which is not correct)

https://www.royalmail.com/find-a-postcode - input ME3 0DW and no Grain Tower there

Land Registry search for K835532 and the property description:
 

"land on the north side of Smithfield Road, Isle of Grain, and Grain Tower, Isle Of Grain"

Additional complexity - put into Google "no 1 the thames" and you'll find media articles talking this unusual property and unusual address.

I would like really like to know the postcode in order to use some online tools that require me to input the postcode.

 

Mars - it would need to be a postal address to have a post code hence it doesn't have one. 

OK, that's helpful, that's good to know.

Previously I struggled to explain "I know the address but I don't know the postocde" and I'll have a reasonable explanation.