All in all, the property will likely require north of $50k in repairs/updates to be put into a market-ready condition. 

What condition is the garage in?

Does anyone have a solid resource for pricing rents based on a revised property condition, or would be interested in providing some guidance on pricing it? 

There is also plenty of risk with outstanding liens, damages, property conditions etc.

I think it would really depend on how tight the timeline is, whether they are planning on doing a 1031 exchange if they were to roll into another investment, whether the tax savings on the 1031 outweigh the loss they may take rushing to sell within the timeline, and the location and condition of said duplexes.  

Do you have info on the condition of these units?

If you can acquire a good property, good neighborhood, good condition at a good price AND you won't lose money month to month... 

The owner wants $60k for it, the two apartments are move in condition and rent for $600 & $750/month, taxes are $4k/yr. 

So to sell one property out of the portfolio loan you must pay a 20% margin above that portion of the loan.The rates change based on the condition of the property as defined by the appraiser as good or average.  

I'd say 30 days is a reasonable average to get from vacant to new tenant move in but this can of course vary based off property condition/desirability, competition and amenities provided.