The move comes 22 months after Digital Realty's $7.6bn all-stock deal to snaffle DuPont Fabros in late 2017 – one of the fattest data centre buys that year – and around 11 months since the slurp of Brazil-based bit barn biz Ascenty for $2.25bn.
The latest proposal will be a boost for Digital Realty's capacity in Europe, where it currently has a presence in four cities.
Interxion will add 13 cities to this list, and take the local operation to anticipated revenue of $1.1bn, behind the biggest player in the continent, Equinix at $1.8bn.
Bill Stein, Digital Realty CEO, said in a call with analysts that it needs a Gatling-gun approach to data centres, "covering the full product spectrum, from small footprint cage and cabinet environments, all the way up to multi-megawatt dedicated hyperscale facilities on a truly global basis".
Digital Realty has 18 data centres in the US and locations in Australia, China, Japan and Singapore.
It also runs three centres in Brazil, and picked up parts of Telecity, which Equinix was forced to sell when the European Commission raised competition concerns.