The sooner the better and hopefully with as little damage to the property as possible.

They then said I would have to still go on and modify any long term blocked calendars thus defeating the purpose of a good solution.  

Ideally you'd want within a few blocks, maybe no more than half a mile for the comp to be accurate

Expect to find less desirable properties, deferred maintenance, low curb appeal, maybe even damage that needs to be repaired.

@Carolyn Guertin investing in Detroit should be done on a block-by-block basis.That's actually difficult to do, so we ranked 104 of Detroit's Neighborhoods on our site as Class A, B, C or D to help investors make better decisions and NOT get ripped off.NEVER try to invest in Detroit using zip codes!

"for $___/year, we provide "x" additional inspections")6) Liability policy that covers tenant intentional damage, criminal acts, and unpaid rent when skipped or evicted (through insurance provider that provides this kind of coverage)7) Financial reports per quarter (as whatever period makes sense to you) (this can allow you to advise the owner on the health of their portfolio)8) End-of-year review of the property to show conditions and suggested needed and preventative maintenance items 9) Preferred vendor discounts (requires a contract with a vendor to give better pricing)10) Eviction protection programs (this is usually done "in house" when you have sufficient number of units under your management to be able to offer this kind of program)11) Legal services (requires agreement with landlord attorney to provide those services at set fees)12) Professional photos option (for enhanced listing)13) Professional, licensed home inspection (this is more relevant for older homes to ensure safety and habitability are addressed) 14) HVAC filter replacement program (this can also be a program offered to tenants)15) Pet and ESA screening through pet screening vendor (helps to streamline and increase quality of screening)16) Client portal account for ease of communication, updates, reports, etc.

The problem is these are automated values that don't factor things in like views, condition, or even if one block of homes sells for more or less than another. 

Just so you all know, my brother was blocked by a moderator (I wonder who), but wanted to convey his response here (see below). 

I'm assuming that once these platforms become more accepted as just another asset class (no different then mutual funds) to invest in for one's retirement (and I do believe we're going that direction) the restrictions on who they let fundraise on their sites will actually decrease a bit as the occasional blow up will do far less damage once RE crowdfunding has a lengthy track record. 

In this county there was only 1 McDonalds that close and it closed to move a block away at a traffic light, from there former location in the middle of the block not at a traffic signal.