If I understand your question, I think your best option would be to purchase a two-family house delivered vacant (without tenants). Each floor would have with it's own kitchen, bedrooms and bathrooms. The price and design would depend on the neighborhood and area. Please email me email@example.com and I can prepare a selection of options that might work.
The question is unclear, what specific information are you looking for...Much will depend on your budget; be aware that a mortgage pre-approval letter is required in order to determine your price range and for any offers to be taken seriously, therefore if purchasing with a mortgage visit with any licensed loan officer first; once you determined a budget, shop areas that suit your needs.