I’m afraid to say that if there is no provision in the lease for any money in advance/on account/to go in the sinking fund, then there is no way that you can collect the money from them. It just makes it more difficult for them and rather shortsighted because in the event that there is a big spend, they are going to have to find a big chunk of money as well as the other owners will have already contributed to the pot on the drip.
The difficulty comes if ever they come to sell the property and anyone who has contributed to the sinking fund would be entitled to get that proportion back.
On a practical basis, if there is no mention of a sinking fund in the lease, and they will not all agree, then you cannot impose one.
Can I clarify anything else for you?
I’m happy to answer any specific points arising from this.
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