I have family in the Crafton/Ingram area (Montour School District). They purchased a home for $135,000 and they pay about $350/month in property taxes. The house is two floors and > 900 ft² – but it's not particularly large.

You can search real estate taxes for specific properties on the Allegheny County Real Estate Portal.

There is a Property Tax Rebate Program for older adults and people with disabilities. The maximum standard rebate is $650/year, but supplemental rebates for qualifying homeowners can boost rebates to $975/year.

That being said, a $100,000 home in Pittsburgh will probably need some work – especially if you need to make your home more physically accessible.