IF the congregation finances the KH on their own they own it but most modern Kingdom Halls are financed thru the Society and they own them...
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km 4/85 p.4pars. 14-15Society Kingdom Hall Fund*** 14
Congregations are cautioned not to "create" an emergency. For example, a congregation may have a facility that is small or overcrowded and so may wish to build or remodel, even though the present building is sound and appropriate in other respects. Unless the congregation is able, on its own, to finance the project, it would be premature to consider selling the present facility and assume that funds would be made available from the Society Kingdom Hall Fund to assist in completing a larger Kingdom Hall. Nor do we encourage borrowing money from brothers or financial institutions on a short-term basis, expecting that the Society will make funds available to cover these debts. No matter what may be planned with regard to Kingdom Hall financing and construction, the principle expressed at Luke 14:28-30 certainly ought to apply.
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Are we saying that financing independently of the Society Kingdom Hall Fund should not be done? No. If a congregation chooses to use local financing, it may do so. However, this should not be done with the thought of refinancing through the Society Kingdom Hall Fund at a later date. Likewise, loan guarantees from the Society Kingdom Hall Fund are not available.