(Name of the other side)  Date: 
(Address of the other side)
Dear Sirs,
Re : (the Property address)
Landlord : (your name)

I/We* am/are* writing to demand from you the immediate payment of the sum of HK$(the outstanding sum) being the arrears of rent for X month(s) from (date/month/year) to (date/month/year) now due and owing by you to me/us in respect of the captioned properties.

Despite repeated demands, you have failed to settled the said sum or any part thereof as at the date hereof. (you can deleted this senstence if it is the first time you ask the other side to pay the outstanding sum)
I/We* hereby give you notice pursuant to Section 58(1) of the Conveyancing and Property Ordinance that unless you pay the said sum of HK$(the outstanding sum) to me/us* within SEVEN (7) DAYS from the date hereof, I/we* shall institute legal proceedings against you to repossess the captioned properties without further notice, in which event, you may be liable for the legal costs thereby incurred.
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Yours faithfully,

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(signature here)

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(Block Letter of you name)

* Please choose one