I will say I think the average is closer to 20% of gross revenue. across the board for this type of service.

My question is – if the seller does not reduce the sale/purchase price and I max out on seller concessions, what options do I have to avoid this “wash”?

As the others have mentioned, make sure you add up all the costs, realistically, including developing the land, see what your ARV would be after it's finished, and what your rent would be.

Has anyone done tax deed sales in Montgomery / Philadelphia areas?

Are there any potential risks after I take ownership, like monetary penalties from the city?

Can anyone recommend a third party phone/answering service that can field and respond to maintenance requests from tenants?

Based on the information I can find and an Excel template I am using it would suggest this property is a 9.3 cap and would have cash flow after expenses of around $3000 per month.

What recommendations do you have in terms of what to take a look at/action items after 1 year? 

The monthly cash flow was $1200 after all my expenses.

The corporate clients have been very easy to work with, and they seem less concerned about the dollars charged as the quality of the level of service provided.