You have about 1.25% X your property purchase price in property taxes annually. If a single-family home you also will have hazard insurance which also varies, but you can estimate $50-$60/mo. And then you will also most likely have a water and garbage bill which will vary depending on where you live. And then finally you have maintenance on a your property. Maintenance is an area many who have never owned a home before overlook and can be substantial if the house is older (plumbing, electrical, landscaping, roof, painting, etc...).
If a condo, in addition to property taxes you also have the HOA dues. If a condo the HOA fee will take care of the maintenance of the exterior, but you also may have special assesments from time-to-time. You would also have to investigate what the HOA covers in terms of insurance and other costs.