New agent wanting to maximize return is looking at that co-op.

However, since most of these have taken on large co op loans, the equity buildup is very slow.  

Little would I know that in fourteen years that little one-bedroom co-op would generate about $140k in cashflow and I'm now about to close on it for $280k.

Sorry to the OP for high jacking your thread.

Anyway, to the OP: if you can share what your mortgage payment is, and what the home would rent for, the folks here could give you a lot better answer to your question.

Is there a typo in your OP regarding " buying tax lien" ?  

Detailed ROE on these properties are here in my OP: https://www.biggerpockets.com/forums/88/topics/456...

We inherited a tenant on the first floor who has her own washer and dryer (there is a coin-op in the basement).

I won't relinquish my right to criticize my fellow troops and I won't feel bad about pointing out what are real risks related to OP's question especially when I have extensive knowledge related.

I can't speak to expected returns in the market that the OP has a deal in, but the math is simple either way:  ARV*(1-ROI)-repairs & closing costs - wholesale fee = MAO.