What repair/replacement method provides the best value?

Darryl, the Donalds are entertaining and insightful however, odds are you will never play in the arenas of which he speaks.You will be best served by reading practical down to earth nuts and bolts methods of doing the street level deals long before you building Luxury highrise buildings across the globe.I like Don but his books really won't help the small investor much, other than motivating you to think very BIG!

I will leave out cold calling, DVM and cold messaging as those methods are under heavy fire and require a lot of leads to get deals but some people are experiencing success with these avenues and realtors have been cold calling since the beginning and all the top agents prospect (cold call) daily or they have a team that does this for them.Bottom line this is a business that requires consistency, a team, leadership, systems and constant honest analysis of the data and numbers to make rational decisions. 

Check with your agent to see if the Insurance company has an accepted method of calculating the ACV of the building

You need some type of a reliable method for allocation.

So Get your cost/deal figured out for every feasible lead generation method you can think of ( I was just being polite..

As mentioned above, in the "subject to" method, you purchase the property "subject to the mortgage." 

I understand the 70% rule and I know of (have yet to practice) the fixed cost method for calculating MOA.

I have done well over 150 ceilings with that method and it makes it much nicer than wetting and scraping.

Integrate your methods.