Questions about my first rental property

[Christian Martinez]

Hello, thank you for your answers in advance! I’m an up and coming buy and hold real estate investor. I’m looking into investing in my first rental property (duplex). My offer has been accepted today and I’m wondering if it’s normal to have my real estate agent ask for tax returns and or a schedule E from the seller.

Unit A and B are both rented out and under a lease agreement until August 2021. The seller is an older real estate investor that is interested in selling his portfolio. With current rents the property will cash flow, however the tenant in unit B is a family friend and the current owner is providing the tenant with a $200 monthly credit. If I do purchase the property is it wise to keep the tenant in unit B paying the lesser amount (even though it say otherwise in the lease agreement) or raise the rent?

Both units are 3 bedrooms 2 bath 900 sqft. Unit A rented at $950 unit B at $750.

Thank you again.