Technically the title/deed of the KH building/land is in the name of the congregation (eg. South West Congregation of Jehovah's Witnesses) which is set up as a non-profit organization with it's own Tax id # (separtate from the WTS or any other congregation). If the KH is shared with multiple congregations only one holds title. This title/deed is signed by 3 trustees - usually 3 congregation elders (this has to be updated frequently if any of these move, are deleted, or if the elder body decides to change).
Make no mistake, however, the KH is "owned" and controlled by the WTS (technically the branch). In the past, the local elders were allowed to make certain decisions about the use, the purchase/sale, or renovations of "their" KH with little input from the branch - mainly guidelines/suggestions. No more. At least in the US, beginning in early 2007, all decisions regarding the KH (no matter how small) are to be made through the RBC (regional building committee). This policy was laid out in a multi-day training session up in Patterson when all the RBC heads were invited (I believe it was late 2006) where it was explained this would be immediately instituted as a control measure. For example, if the local body decides to replace the carpet or to purchase new sound equipment they can no longer just do this - they must inform the RBC who will then decide if it is necessary and if so, THEY will make the arrangements, send in THEIR guys and the congregation is subsequently billed accordingly. This same scenario applies to all KH renovations, equipment purchases, the construction of new KH's, or the sale of existing KH's.
It's all about control now and it is scary. And you WILL comply or heads will roll. As an example, recently here in one local cong. the body of elders decided their KH needed a few minor repairs. As instructed, they contacted the RBC who inspected the KH and recommended renovations totaling the ridiculously exorbitant sum of $97,000. This body of elders knew that they could get this same work done with local brothers at a fraction of the cost, so they decided to ignore the RBC's recommendation and to handle this themselves. Big mistake. Of course, the same renovations were completed at the much more reasonable cost of $19,000 and the cong. was thrilled with the work and the savings. The RBC brothers were not thrilled, however, once they got wind of this and well, let's just say certain local elders in this cong. were made examples of and are no longer serving in the same capacity as they were previously. Also, to make sure this did not happen again, each area cong. got the dreaded TO THE BODY OF ELDERS letter shortly thereafter.
Historically the RBC arrangement has been rife with collusion as certain RBC brothers have for years been lining their pockets with serious kickbacks on renovation and new construction projects. Now with this new arrangement, the RBC as the WTS policing agent basically have been given carte blanche on everything having to do with the KH's. The RBC heads are put in place by the WTS and thus operate under the WTS's control. As such, the RBC can "recommend" anything and there is nothing the local brothers can do about it.