Also John, some syndications will allow you to invest using "sophisticated investor" status instead of accredited investor.

If the syndicator has a proven track record then the level of sophistication makes up for the money not being on the table.

I am only using Excel at this point but need to upgrade to a more sophisticated system. 

Once you’ve read enough T12s and understand avg expenses per door whatever market you’re in, you will better understand your proforma and how the property would operate You can simply take out the perceived capex line items, then categorize as Capex/Major Repairs (roof replacement or repair, re-plumbing, repave parking lots, ac, electrical, interior & exterior Reno) Expenses (taxes, insurance, service contracts, management, utilities- wst, turnover, legal, maintenance, G&A, payroll) Now take the income minus expenses.

All non-accredited investors, either alone or with a purchaser representative, must be sophisticated—that is, they must have sufficient knowledge and experience in financial and business matters to make them capable of evaluating the merits and risks of the prospective investment.https://www.investor.gov/additional-resources/gene...

For those that are reading this and have an open mind that yes, the Cash on Cash Return analysis is flawed and you need to get a handle on a more sophisticated analysis, then do READ What Every Real Estate Investor Needs to Know about Cash Flow... do notice that this book is ALL about Cash Flow, and it is FAR different than the Cash on Cash Return most people use in BP.

For the serious investors, I spend time with them and if they are accredited or sophisticated we do deals together and that part has paid off very nicely.

I'm really curious on how sophisticated investors dealt with this, when the end of the loan is up, bad lending cycle/high rates, how do you approach that?

Well, it could get tricky.Some of these web sites are very crude, and some are much more sophisticated. 

It seems like you need a database management software to host the site, and then to make it easier to work with than the competing brokerages.You could contact an existing service that operates in a different country - in the US, it might be Zillow or Trulia or the MLS service themselves - and see if they'd be interested in partnering with you and using the software they already have, since their solutions are already very sophisticated and well refined.