De or het locatieontwikkeling?

The correct Dutch article is:

de locatieontwikkeling

Rule Words ending in -ing: almost always de. See the rule

How to use locatieontwikkeling

the locatieontwikkelingde locatieontwikkeling
this locatieontwikkelingdeze locatieontwikkeling
that locatieontwikkelingdie locatieontwikkeling
our locatieontwikkelingonze locatieontwikkeling
your locatieontwikkelingjouw locatieontwikkeling
every locatieontwikkelingelke locatieontwikkeling
which locatieontwikkeling?welke locatieontwikkeling?
a big locatieontwikkeling / the big locatieontwikkelingeen grote locatieontwikkeling, de grote locatieontwikkeling