Ridiculous housing prices in Westchester NY

[Chris Rey]

I've read the success stories about so and so buying a house for $100,000 and renting out 3 units to complete the perfect cash flow of $400-600 per month.

However, how would one do such a thing with a similar scenario in Westchester NY with a house that is going for 400k+? The numbers don't seem to add up. It always seems like your mortgage and expenses will leave you at a negative.

Ideally I would love to have a 2-3 unit house I can live in, but I don't see the numbers adding up to a positive cashflow.

Any experiences on this?