kontor

/kontor/

Cases

SingularPluralWhen to use it
nominativekontorthe officekontorlathe officesthe plain dictionary form — the doer of the sentence
genitivekontornuthe office'skontorlanıthe offices'the owner — whose it is
accusativekontornuthe office (as the object)kontorlanıthe offices (as the object)a specific, known object — whom or what
dativekontorğato the officekontorlağato the officesdirection or recipient — to where, to whom
locativekontordaat / in the officekontorladaat / in the officeswhere it is; also having — mende bar, "I have it"
ablativekontordanfrom the officekontorladanfrom the officeswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mykontorummy officekontorlarımmy offices
yourkontorungyour officekontorlarıngyour offices
his / herkontoruhis / her officekontorlarıhis / her offices
ourkontorubuzour officekontorlarıbızour offices
you all'skontoruğuzyou all's officekontorlarığızyou all's offices
theirkontorlarıtheir officekontorlarıtheir offices

The overlap in the last rows is real, not a mistake: kontorları can mean "his / her offices", "their office", or "their offices" — context decides.