what is wrong with a house next to a vacant lot?

[Maiko Miyake]

I am looking at three residential properties. They all have one thing in common - they are adjacent to a vacant lot. Any problem with this? These are rowhouses in the center of city, close to commercial areas. For two out of the three properties, it looks as if a rowhouse next door dissappeared, so the house I am thinking of buying has no windows on the side, but the third property does have windows on the side and will affect the amount of light the house will get if something gets built next door. That is all what I can think of as a risk, anything else I should consider? Also, is there a way to mitigate a risk?