[ULPIANUS libro secundo institutionum. ] §8.4.1.prAedificia urbana quidem praedia appellamus: ceterum etsi in uilla aedificia sint, aeque seruitutes urbanorum praediorum constitui possunt.
[ULPIAN, Institutes, Book 2] Indeed, we call buildings in a city estates. However, even if there are buildings in a country villa, servitudes of urban estates can equally be established.
§8.4.1.1Ideo autem hae seruitutes praediorum appellantur, quoniam sine praediis constitui non possunt: nemo enim potest seruitutem adquirere uel urbani uel rustici praedii, nisi qui habet praedium.
Now, these are called servitudes of estates for this reason, because they cannot be established without estates; for no one can acquire a servitude, whether of an urban or a rustic estate, unless he owns an estate.