Depending on where you live and how cold it gets, the original (up through 2016) model's battery may be pushing it for 50-miles if it is high speed, super cold, or there's a bunch of steep grades to climb. EVs don't work as well (range wise) when it's cold out...partly because the battery won't discharge as much energy, and all of the cabin heat comes as a result of battery functions rather than waste heat from a combustion engine. Drag is the biggest controllable thing for range...drag goes up at the cube of the speed. So, taking simple numbers at 30mph, versus 50, 30^3=27,000 versus 50^3=125,000 or 125/27=4.63x more drag...speed on any vehicle is an energy use factor.
If you can charge at work, it would be no problem. In the summer, you should easily make it without charging at work. If you throw in the REx version, you'd have the engine based generator to let you keep going. But, that adds costs and complexity to the picture. A pure electric has less to go wrong, not saying that happens all that often. German cars are not cheap if they fail out of warranty.
The 2016 MY version has an EPA rating of about 80-miles. Throw in a little battery degradation of maybe 5% or so, and cold weather, and 50-miles may be cutting it close. IN a nice 70-80 degree day, you might see over 100-miles if you aren't stressing the thing.
In 2017, the started using a larger battery, and then the newest ones are using a larger one yet. Either of those should have no problem with that commute in any weather.
If you live where it gets cold, you will want to probably get winter tires, and those are only available with 19" rims, and then, only on the 5" widths. The 20" rims are summer tire only. The stock 19" rims come with all-season, which might be okay for the winter, but the winter tires would likely be better. Dont' even think about the summer tires if there's snow.
2011 535i x-drive GT, 2014 i3 BEV