Does it mean something I am not understanding?

Not siding with the contractor, but as an investor you will have to learn to understand costs better and when it doesn't seem possible for the contractor to complete the work at the stated quote its best to walk away.

I understand some of the economic factors that can lead one to a particular city or province (or state), but unsure of some of the key elements as you funnel down below that level.Appreciate any insight.Tyler 

The only thing is, he mentioned that I will have to file an extension because, understandably so, he does not have the time to complete my small business returns by 3/15 (8 days from today).

I don’t understand why everyone gives so much anxiety to the due on sale clause.

For me as well as the seller.First, you have to define Sub to financing.Do you mean the reckless kind where you overpay for a property, take over the financing and borrow from others to cover closing costs and holding costs when you have no money, no credit, no income, no reserves and can't tell a warranty deed from a deed of trust and you close on the kitchen counteror do you meanbuying below market value, already having a nice income, having reserves, using escrow and title, already understanding the due on sale clause, have done a lot of creative purchases and know when to use and when not to use creative finance and how to recover if something goes amiss?

From what I understand you could be buying something that is completely dilapidated but even if that was the case if it was for 10k or less, you could sell the land. 

In a city like Philly, you will face many challenges - you need to learn the market and know the neighborhood and the block and make sure all of your numbers are within reason, you need very reliable contractors, you need a to understand the permit process, you need to be familiar with market expectations. 

I the understand the wiring for this specific purpose equipment can be considered with the tangible property. 

A realtor who understands the numbers can help analyze the property’s projected cash flow and ROI, plus they might know local leads from probate attorneys or even “drive for dollars” efforts that can reveal off market gems.