Just a common sense rule.I'd like to be your sounding board regarding your strategy for your next purchase...

Is this common?

They both said that it is common practice that people buy investment properties on their own names, and after a few weeks of the closing, they transfer the title to a single owner LLC.

Most hard money lenders do want to take a look at your credit but most will take a more common sense approach, focusing more on the credit report than on the credit score. 

Square footage is common. 

This is pretty common to keep your first few purchases in your personal name in order to take advantage of high quality loans early on. 

Are off-market listing more common in commercial properties than in MF? 

Although @Guifre Mora presented some common situations there are a number of lenders for which 12 months is standard and extensions can go several months without penalties and there are no prepayment penalties so it really depends on what matters most to you. 

Is this common practice?

Other questions folks might ask you is, whether it's just porches and common walkways, or also the parking area, also sidewalks, etc.I only say this because I've had "misunderstandings" a few times over the years about exactly which snow was going to be removed :-/