/usr/share/php/sabre21/Sabre/VObject/Property/ is in php-sabre-vobject-3 3.5.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/sabre21/Sabre/VObject/Property/Binary.php
/usr/share/php/sabre21/Sabre/VObject/Property/Boolean.php
/usr/share/php/sabre21/Sabre/VObject/Property/FlatText.php
/usr/share/php/sabre21/Sabre/VObject/Property/FloatValue.php
/usr/share/php/sabre21/Sabre/VObject/Property/ICalendar/
/usr/share/php/sabre21/Sabre/VObject/Property/ICalendar/CalAddress.php
/usr/share/php/sabre21/Sabre/VObject/Property/ICalendar/Date.php
/usr/share/php/sabre21/Sabre/VObject/Property/ICalendar/DateTime.php
/usr/share/php/sabre21/Sabre/VObject/Property/ICalendar/Duration.php
/usr/share/php/sabre21/Sabre/VObject/Property/ICalendar/Period.php
/usr/share/php/sabre21/Sabre/VObject/Property/ICalendar/Recur.php
/usr/share/php/sabre21/Sabre/VObject/Property/IntegerValue.php
/usr/share/php/sabre21/Sabre/VObject/Property/Text.php
/usr/share/php/sabre21/Sabre/VObject/Property/Time.php
/usr/share/php/sabre21/Sabre/VObject/Property/Unknown.php
/usr/share/php/sabre21/Sabre/VObject/Property/Uri.php
/usr/share/php/sabre21/Sabre/VObject/Property/UtcOffset.php
/usr/share/php/sabre21/Sabre/VObject/Property/VCard/
/usr/share/php/sabre21/Sabre/VObject/Property/VCard/Date.php
/usr/share/php/sabre21/Sabre/VObject/Property/VCard/DateAndOrTime.php
/usr/share/php/sabre21/Sabre/VObject/Property/VCard/DateTime.php
/usr/share/php/sabre21/Sabre/VObject/Property/VCard/LanguageTag.php
/usr/share/php/sabre21/Sabre/VObject/Property/VCard/TimeStamp.php