UDST / developer

Redesigned UrbanSim developer/pro forma models
https://udst.github.io/developer/
BSD 3-Clause "New" or "Revised" License
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Basic financing mechanism #52

Closed pksohn closed 7 years ago

pksohn commented 7 years ago

We can add a very simple financing mechanism to the pro forma model. The pro forma model that Jessica Hitchcock shared with us and presented in class provides a good example.

Each of these can be added as config items (they would go in proforma.yaml, values for Santa Cruz example development in parentheses):

And other variables can be calculated and factored into the profit calculation in the lookup method:

The total financing cost is added to the total development costs, and then the calculation proceeds as usual. The way Jessica calculates profit is exactly the same as how pro forma calculates it, so I think this approach would work well.

I think this provides some helpful levers on the financing side, e.g. how do interest rates affect development?

@conorhenley would love any feedback.

conorhenley commented 7 years ago

I don't have strong initial impressions other than additional levers that are reasonably easy to incorporate but not required are probably good. Do we have any idea of how these inputs will vary across a region? Or are we really just looking at situations where interest rate changes apply across the board and affect willingness to take risks?

waddell commented 7 years ago

I think we should elicit some feedback about other property types besides the MF project in Santa Cruz that I think these are coming from, just to check that the inputs needed are already covered.

pksohn commented 7 years ago

Addressed with #54. Paul, agreed - this is just a prototype but we reevaluate as we test to make sure all necessary inputs are covered.