Interesting investment opportunity, but how to finance it?

[Chootar Laal]

we bought a rowhouse (single family) last year. now the place next door to us is converted into 2 condos and both are up for sale. we dont want to buy both, just 1 of them.

since its right next door to us, can it qualify as a 2nd home? proximity issues? if not, then an investment? as an investment, what are the requirements? 20% down?

any other options? its my first real estate investment purchase other than our primary home that we bought last year.