We then purchased our rental property using a combination of HELOC and savings. 

Unit of comparison could be per door (unit), per Sf, or total property, etc.Not sure if the balance of value between MF and the commercial building but if I couldn't find similar sales I would probably use a combination of both MF and commercial comps- assuming a retail or office space.Income Approach- appraiser will reconstruct the operating statement from market data and then will develop and opinion of the NOI and overall cap rate.

Do not try anything unique or different until you have gotten some experience.  

I really don't know what anyone else would say, but its unique situation and that is absolutely what i would do here and that is what you asked.I hope it helpsI did some research and each state is different.

But combine it with knowledge and understanding of the Stock Market, and your steering can help you to avoid even the largest obstacles.Owning Brooklyn Real Estate was itself a good thing during the Great Recession because it only slightly dip.

You may want to do a combination of both. 

A home inspector is uniquely  trained in so many components of a home that a Section 8 inspector has NO CLUE about.

@Joe Zaniboni I think the only thing you can do is combine your lists into a master list and check for duplicates.  

The most accurate way to do it will be you, create an excel of a variety of different properties, from 2beds to 4beds etc etc, list pricing and location of these places, and any unique amenities then throughout the year go through their calendars and mark down their booked days.You may be correct on the HIGH amount of unbooked days, if the place you're looking at is primarily just a summer retreat then it may be too early to tell what their occupancy is.

Then maybe you can combine the two cash lumps together and buy a duplex or triplex (using a loan) and start creating wealth by living in part and renting out part.