With our old housing stock, there are many interesting twists in a building’s use that could have occurred in its 100 (sometimes 200) year old lifetime. So, it’s important to know what its legal use is- specifically, if there is a question, pay the small fee to get an official zoning certificate. Does its current use fall within what the property is zoned for? If there still any questions here, consult an attorney who specializes in this type of real estate law. It can save you a massive headache down the road. Typically, you may have looked up what the tax assessor says the property is zoned for but don’t let this put your mind at ease as the tax assessor and zoning are not always on the same page! Finally, there is fire code. Fire code doesn’t care what your building should be doing. They care if your building’s fire protection devices covers its actual use. Thus, even if your use is illegal, in the very least make certain it is fire coded as such. This is a huge liability if, god forbid, a fire did do damage. In a nutshell, homework before purchase could save you a lot of potential aggravations down the road.