This is one of Adobe Lightroom presets that I use on a lot of my Street Photography. It’s quite a contrasty black and white but I think it works particularly well with Street Photos as well as some portraits too.
It’s totally free and you can download it here. Once you’ve downloaded it, you’ll need to unzip it and save it in whichever folder you store your Lightroom presets in. You should then be able to use it when you next use Lightroom.
Please let me know what you think of it.