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What is a property title number：A unique Title Number is allocated by the Land Registry to each and every property that is registered. ... Title Numbers begin with 2 or 3 letters following by a number.

title是产权、业权。
这里property title number 其实是property title certificate number，“房产证书编号”符合表达习惯。

https://www.landreg.gov.hk/www.landreg.gov.hk › pdf › search_and_reg_fees_...
查冊及註冊收費表Search and Registration Fees SchedulePDF - Translate this page
Securing Your Property, Supporting an Open Market. 2015 年3 月 ... Registration of any deed of mutual covenant, its ... 如該等契約所指的財產單位數目為–. Where the number of property units thereunder ... 判決證明書或解除訴訟外債務人物業查.
https://quizlet.com/quizlet.com › 術語6-flash-cards
術語6 Flashcards | Quizlet
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performance obligation. 履約責任. title document. 業權文件、契約文件. mortgage, transfer, seizing. 抵押、轉讓、扣押. the title to the property. 物業業權. approvals.
http://www.hkilt.com/www.hkilt.com › news › 102_Deed of Exchange
Deed of Exchange - hkilt
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THIS DEED OF EXCHANGE is made the day of ... number, sections and undivided shares etc:- （a）描述，地址， ... 第二物業第A部分的契約及協定須受. 以下規限：-.

编号没什么好说的，关键在于property title的译法。

"property"的释义之二：
1. something of value, either tangible, such as land, or intangible, such as patents, copyrights, etc
2. (Law) law the right to possess, use, and dispose of anything
“title”的释义之一：
(Law) property law
a. the legal right to possession of property, esp real property
b. the basis of such right
c. the documentary evidence of such right: title deeds.
释义来自：Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
我选的算是property-2和title-c吧。

看了其他人的回答，产权证、房产证、物业什么的。
物业不大可能。
这里肯定是在说产权，但是财产具体是房屋还是土地没有指明。当然，题主可以根据上下文自己判断加译，但是我们没有上下文可依。

具体译成什么，我们提供选项，选不选选什么在题主自己。翻译果然还是需要相关的行业知识作辅助。