Given the limited amount of info we know from this post, your best bet is to get a lead inspection from a licensed lead inspector.
I recommend Lead Probe or ARC environmental. I have used ARC multiple times for myself and clients. This is the only way to know where lead lies in your home - they will scan each surface with an XRF gun.
Once they give you the report of all the things that failed, you can go about remediating it with a lead abatement contractor. For the average Baltimore City row home, budget 5K if you hired this out professionally. I actually did it myself and saved about 4 or 5K.
There are three ways to make something lead free:
- Remove the surface
- Cover the surface
- Replace the surface
Examples
If your old boiler has lead paint (and you plan to upgrade to central air) --> remove the boiler
If your basement I-beam (structural support) has lead paint --> cover the I-beam with drywall
If your base trim board has lead paint --> replace the trim
Ideally you want your house to be LEAD FREE CERTIFIED. This will prevent you from lawsuits that suggest negligence on your behalf. Fully lead free means there is a safe amount of lead in AND outside of your home. A property that's found to be free of lead paint is exempted from annual registration fees and risk reduction inspection requirements.
If you can't get your property fully lead free, you will have to get it inspected before each new tenant move-in. This is called a full risk reduction certification.
Since 2011 in Maryland, the words "landlord" and "lead" didn't mix well together. Do not skimp on this.
In 2011, the Maryland Court of Appeals struck down portions of the Maryland Lead Paint Act that protected landlords from being sued by their tenants. Before the case, if landlords were in compliance with certain parts of the Lead Paint Act, they could offer $17,000 to a tenant who had been poisoned by lead. If the tenant accepted the $17,000, the landlord could not be sued, and if the tenant rejected the $17,000, the landlord was also immune from a lawsuit. The Court struck these parts of the Lead Paint Act down as unconstitutional, and tenants and their children who have been poisoned by lead paint are no longer limited by the damage cap and immunity provisions.
Hoping this helps!