Hi,
We would advise in the first instance to complete a Form 17 to declare beneficial interests in the property based on the percentage split you wish to declare for each individual, i.e. in this instance, 0%/100% split.
We have attached a link to the Form 17 as well as guidance which may provide additional support on your situation:
TSEM9852
In regard to the Property Income Allowance, the £1000 allowance is given to each individual to use against business profits, or expenses, whichever is more beneficial to yourself.
Thankyou.