They either had below mkt. rents or high vacancies and bad reputations and with super managing them I significantly grew the cash flow. 

All complimented with Amazon fulfillment centers, google, and more tech manufacturing jobs.The bad reputation of “Detroit” comes from OOS investors wanting sub $40,000, D class properties in poor condition, because they pencil out to 2-3% deals on paper.

They are heavily capitalized and ready to do the work to find the right deal and work with local & reputable agents.

Can you recommend me a reputable and honest construction company? 

Use this amortization table, from a reputable website:http://www.bankrate.com/calculators/mortgages/amor...Ignore the difference in layout/presentation - what's important is that the ending balance for each month in their table matches mine exactly.

I know it can depend on factors like the borrower’s credit, payment history, and loan terms, but I’m looking for general guidance or ballpark percentages based on your experience.Top Buyers/Companies:Who do you recommend as reputable buyers for these types of notes?

I hope you are asking two separate unrelated questions, because there's no point in doing cost segregation for properties held inside your self-directed solo 401k, save for some very rare exceptions.Some of the Bigger Pockets experts who operate reputable costs segregation companies are @Bernard Reisz, @Yonah Weiss and @Julio GonzalezSome of the Bigger Pockets experts who offer Solo 401k administrator services are @Dmitriy Fomichenko, again @Bernard Reisz and @Brian EastmanReach out to them and see if they can help.

With that said can anyone suggest reputable lenders that are able to assist me with a debt consolidation loan of ~25K?  

I would appreciate any advice on whether it's a good idea to invest in land on a slope and the potential challenges of building on such terrain.If this seems like a worthwhile investment, can anyone recommend reputable construction companies that specialize in cabin builds on slopes? 

I've facilitated the purchase of 5 properties in last two months at a reputable national wholesaler.