Benedikt already gave a good answer and he is right that a hiking boot would be a massive overflow. It just looks ridiculous because it is simply not designed to be used on flat terrain. What you need is a comfy and weather resistant shoe. Therefore you could go for a light hiking shoe.
I am wearing my approach shoes in daily use from time to time. But just two points regarding this:
- Most noticeably the sole wears off pretty fast on asphalt and therefore you have to replace the shoes quite early. Because outdoor equipment is a growing and somehow trendy business the shoes are expensive too.
- Even now (with decreasing temperatures) I am sometimes feeling too warm on the feet. You can adjust with lighter socks but still you could think in bringing other shoes for the office. Also to have an adequate more stylish looking office shoe or to simply have a very comfy slipper if your boss allows that.
In general lighter style hiking shoes have no disadvantages because they are made for walking even with difficult conditions/terrain. If you can live with the higher prices it's very fine in my opinion.
The longer the distance and the worse the terrain you are walking in daily, the more sense makes a proper hiking shoe.