Rain Water Seeping Into Downstairs Bedrooms

[Abram T.]

Hello BP Community,

I closed on a three family home in Garfield, NJ about four months ago and things have been going well so far. One of the units is now vacant and I started prepping the unit for renovations by stripping out the old carpets and moldings. The previous tenant told me that the corners and edges of the bedroom walls have been getting wet when there's heavy rain. I saw signs of wet corners and edges after pulling away the carpet and moldings. There was black mold too. I cleaned what I could with store-bought cleaners, but I want to make sure to prevent black mold and wet bedroom walls in the future. There also is signs of water leaking into my bedroom from the upstairs apartment bathroom. Would sealing the edges of the foundation (pics below) with drylok or some other sealant prevent the water from getting into my rooms in the future? That way I can just clean the black mold, dry it, then seal the foundation edges, then move on with renovating the bedrooms. Am i just better off calling a professional? Just thought I'd get your thoughts before I pick up the phone. I've attached pics for your reference. Thank you for your time.