The case, being heard this week by Chief High Court Judge Helen Winkelmann, will likely decide how some funds from the property's sale are divided up.
Although Mr Hotchin is seeking reimbursement for the construction costs, former KA No 4 trustee John Radley said yesterday there had never been any agreement this would happen.
"We never agreed how Mr Hotchin's expenditure should be dealt with," Mr Radley said.
Appearing as a witness for KA No 4, Mr Radley said Mr Hotchin's contribution to the property was not recognised as a liability in the trust accounts.
Yesterday an accountant who did work for both the trusts and Mr Hotchin, Dwayne McGorman, told the court he believed there was no obligation for reimbursement.
"I don't believe there was ever an obligation for him [Mr Hotchin] to be reimbursed," Mr McGorman said.
When the trust took over building the mansion, Mr McGorman said, the ownership of the unfinished house Mr Hotchin had paid for was a "grey area".
The Financial Markets Authority - which has freezing orders over the house - is also involved in the claim between Mr Hotchin and the trustee.
The FMA has brought civil action against Mr Hotchin and five other former Hanover directors or promoters and because of this it says it has an interest in the case being heard this week.
Parties will deliver their closing arguments today.