I have to admit that I was not expecting this reply, and it did give me pause. Maybe I didn’t expect you to have an answer at all. Not sure why, Anyway.
When Dix Park was still Dix Hospital, and this was all being talked about, the city’s first consultant recommended putting development on the edge of the park, just as you suggest. At the time, they recommended this as a way to generate revenue that could be used to accelerate the implementation of the master plan for the rest of the park, and also to “activate” it, with a built-in set of park users and “eyes on the park” to make sure it didn’t become a desolate, lawless wasteland. As I recall, mostly market-rate development was on the table at the time. I don’t recall much discussion of affordable housing.
My thoughts at the time were: “OK, good idea, we need more residents within walking distance of this park and downtown, and the money won’t hurt either.” But then the Dix 306 group came in and argued that all of Dix should be a park. At first I thought they were a bunch of NIMBYs but they I realized they had a point.
They hired a consultant, who made the (IMO very salient) point that having clearly-defined boundaries between public (park) and private (apartments/condos etc) space strengthens both. And thinking about it, I definitely agree.
Think of how different Central Park would be if the “Billionaires Row” skyscrapers stood between central park and 59th street, rather than across from it? Much different, and almost immeasurably worse.
(I digress, but for this reason, I am kind of pissed about what NCSU has done with the Spring Hill Precinct of Centennial Campus in their master plan. They went to all the trouble of creating “The Seam” - a fantastic idea; a clearly defined boundary between park and campus - and then went and put two buildings on the other side of it. WHY?!)
So, Dix Park should come right up to Lake Wheeler Road, for the entire length. The development belongs across the street. This is a big part of the justification for upzoning Fuller Heights, and provides the “origin story” for Park City South/Rockway/The Weld/ETC, all of which I think is a good thing.
Now, to address affordable housing: By not allowing development on this public land, Raleigh has indeed sacrificed an opportunity to do an RFP and get a good bit of AH out of the deal. HOWEVER, look just to the north/east of Dix, and what do we find?
Something like 23 acres of Affordable Housing (yellow and red on this map):
Heritage Park and Gateway Park. All of it developed at very limited density, especially given its location. Heritage Park especially, developed in ~1975, at the absurdly low density of 10 units per acre, is actively being planned for redevelopment. Gateway Park was built around 2004 at the still-inadequate density of 14 units per acre, but is a good bit newer, so should be considered a 15-20 year horizon project for redevelopment.
Across these 23 acres, it would be shameful to wind up with less than ~2000 mixed-income units, which is about what could be achieved with a 5-over-2 format. 5,000 could be quite easily possible if we’re considering something more substantial.