Sale of "Som" meaning of transaction ?

Willem Willemsz Linschoten in

sijn qualite vercoopt Thomas Dircxsz

een huys ende erve staende buyten

de watersloot genaemt fesom

voor daerthich hondert gul[den] gereet gelt

comt voor de deuten 

translated:

Willem Willemsz Linschoten in

his quality sells to Thomas Dircxsz

a house and yard* standing outside

the watersloot** called fesom***

for thirty hundred guilders ready cash

comes for the "deuten"****

*: meaning the land on which the house is situated

**: water ditch

***: this is a name, but I am not sure about the spelling

****: I don't know what deuten means

P.s. outside should be read as beyond 

a few corrections/ additions:

derthien (13) instead of daertich (30)

the house is called 't Som

comt voor de deuten ----8 guldens 2 stuivers 8 penningen ; this is a tax to be payed extra on every sale/ purchase

Willem Willemsz Lintschoten in
sijn qualite vercoopt Thomas Dircxz
een huys ende erve. staende buyten
de watersloot, genaemt t'Som
voor derthien hondert gulden gereet gelt,
comt voor de deuten    VIII gulden II stuvyers VIII penningen

Willem Willemsz Lintschoten sells Thomas Dricxz a house and premises for 1300 guilders.
The house had a name: 't Som. The house was situated outside the 'watersloot'.

Thank you all very much!