The 379 metropolitan areas surveyed were evaluated in nine categories: housing affordability (cost of living), transportation, jobs, education, climate, crime, health care, recreation and ambiance (museums, performing arts, restaurants and historical districts).

(I think they go towards the full 27.5 cost of the condo.. but I already started that 5 years ago)Do i need to start a separate depreciation category for 27.5 years, which would go 5 years beyond the actual depreciation of the condo?

Tax sale laws not only vary state to state, but also county to county within each state.There are several sites that will give you information on these sales including one of our own members here GD Haslip who runs delinquent tax sales .com

Here is a brief overview of the process in CA but the laws can vary per state so verify in your state.

If you want to see those expenses, then a sub-category under Projects in Process would be better for initial recording.  

Rent and prices vary depending on location, size and amenities.

Your actual results may vary, depending on a variety of factors.Usually, yes - if you are doing multiple projects within one entity (or under your own name) profits and losses are netted against each other and your taxable income becomes the net amount of profit on all completed projects.In general, a flipping business will NOT have capital gains/losses.  

I work hard to completely understand the real estate market within my farm area that can vary widely within 5 blocks... and this guy has a blanket opinion on an entire country.

The numbers may vary based on how much time has passed. 

If you find yourself saying "one time", then it's a capital expense, not a monthly and it goes into a different budget category.