Can someone please help me with one paragraph? It's from this Wikipedia article: https://en.wikipedia.org/wiki/Enclosure
"...As examples of engrossing in the neighbourhood of Dorchester, the writer instances the manors of Came, Whitcomb, Muncton, and Bockhampton. The first, he says, about thirty years before, had many inhabitants, many holding leasehold estates under the lord of the manor for three lives. Some of these had estates of 15l., 20l., and 30l a year, being for the most part careful, industrious people, obliged to be careful to keep a little cash in order to keep the estate in the family if a life should drop".
There are three things I don't understand here.
1) the second sentence, "many holding leasehold estates under the lord of the manor _for three lives_". Does that mean "for three generations"?
2) the third sentence, "15l., 20l., and 30l a year". What does "l." stand for? There is a link to the article about the pound sterling in the text, but does that really mean "£"? Why "l."?
3) the third sentence, "if a life should drop". What does that mean? Can somebody please explain?