You get 75 mortgage and you get your money back- You make money in the spread between rent and mortgage and you have 75 to invest again- every 6 months you buy a property reinvesting and refinancing the same 75- meanwhile the properties you initially purchased increased in value and your mortgage balance decreased ... 1 to 5 years later (depending on the market increase) you can refinance again on the same houses...

Is there a deprecation method utilized where the life of the building decreases with time (i.e. 

Depending on how bad it is, I would anticipate higher vacancy and possible decrease in rents.  

Richard, this depends on your risk tolerance and whether or not your property will still cash flow after the cash out.Personally, I prefer to leave some equity in the property, to be tapped in case of personal hardship or if rents should decrease significantly in the future.

Your capital will be expensive at first, but as you grow your investor base you can decrease the cost of capital and structure the deals in a more profitable way.

You payments will decrease with a 30 year mortgage but your interest rate will rise to probably around 5%.

NA Cummins  Realtors and MFH owners are likely to overinflate their revenue and occupancy rates, while decreasing their actual expenses.

I currently rent at about $700 a month and next year my rent will decrease to around $600.Im looking for advise as to what direction I should go with investing.

If you are set on not offering a deposit you will need to make your offer look more attractive in other ways, maybe increase the offer, decrease the inspection contingency period, promise a short close.

., How much has the mix of the condition of properties sold contributed to decreases and increases in real estate price indeces (e.g., Case/Shiller) throughout the economic cycle?