BERLIN, Sept 29 (Reuters) – Expropriating large residential landlords in Berlin would not ease the city’s housing ‌shortage and could make its rental market more ‌rigid, according to a study by the Kiel Institute for the ​World Economy published on Tuesday.

Elif Eralp, the far-left leader pushing to take over as mayor of Berlin, has pledged to expropriate more than 200,000 housing units from ‌corporate landlords in a ⁠campaign that made the party reach its best result in the German capital in ⁠this month’s election.

Here are the key points from the study:

• If funds required to compensate companies such as ​Vonovia were ​instead invested in construction, ​Berlin could build up ‌to 71,000 additional apartments by 2045, the economic institute said. That could leave asking rents up to 8.7% below levels otherwise expected by then.

• The affected housing portfolios have an estimated market value of €40.2 billion ($45.6 billion), ‌although compensation could be around ​half that amount, the study said.

• “What ​matters is not ​who owns the apartments, but whether new ‌ones are being added,” said ​co-author Jonas Zdrzalek.

• ​State ownership would widen the divide between tenants with regulated existing leases and prospective renters, reducing ​mobility and worsening ‌inefficient use of housing, the study said.

($1 = 0.8821 ​euros)

(Reporting by Christian Kraemer, writing by Maria ​Martinez, editing by Thomas Seythal)