I took it upon myself to try some analysis - granted I am not an expert on condo sales. But I made the following basic assumptions:
150 floors
25,000 avg SF per floor
3,750,000 total SF
250,000 common / mechanical SF
3,500,000 residential SF
42 months to completion
$750 development cost PSF (not including loan interest)
$2,812,500,000 development cost (not including loan interest)
$1,968,750,000 construction loan draws @ 70%
$46,875,000 monthly construction loan draw
8.00% construction loan interest rate
$294,615,868 capitalized interest during construction
$3,107,115,868 total project cost
$932,134,760 equity @ 30%
$2,174,981,108 loan at construction completion (including capitalized interest)
$1,250 sales PSF
$4,375,000,000 gross potential sales
$4,068,750,000 less commission @ 7%
50% units sold by completion
50% units sold after completion
0% units remain unsold
$2,034,375,000 net sales by completion
60 months after completion to sell out units
$33,906,250 net sales per month from completion to sell out
($22,193,685) equity investment per month during construction
($140,606,108) equity (draw)/distribution at completion
$33,906,250 equity distribution per month through sales period
1.50% safe rate
($907,536,524) PV construction equity
($133,419,087) (PV) / FV of (draw)/distribution at completion
$2,111,238,253 FV distributions after completion
($1,040,955,611) PV equity investment adjusted per safe rate
$2,111,238,253 FV equity distributions adjusted per safe rate
8.35% equity IRR
Based on these assumptions, I get an 8.35% IRR on equity. Seems a little low for a project of this risk level, but it's much better than I would have anticipated. My assumptions could be way off though - obviously, the most important drivers are those relating to average sales per square foot (I estimated $1,250 PSF) and development cost per square foot (I estimated $750 PSF) - small adjustments in either direction result in pretty big changes in IRR.
Anybody who knows about construction - in the US, how much do you think it would cost PSF to develop a very high end, 2000 ft tall condo tower? Is $750 realistic / high enough? I heard that Kelleher was suggesting average sales per SF at $2000, but that sounds absurd to me. Possibly London, NYC, Hong Kong, Tokyo, but no place else.
This analysis is full of holes, I'm sure, so tear it up if you have any interest, it's only a back of the napkin attempt. But it least if provides for me a framework which hitherto I did not have.