Wow - a lot of things being said that really confuse the issues. As a affordable housing professional here are some reality checks.
1. HUD for the most part has eliminated "project" based subsidies. That means most new projects do not get a blanket tenant payments. There are many older projects that do get subsidies and those HAP contracts are a totally different part of the Section 8 program.
2. Section 8 Vouchers is the most common subsidy available to low income tenants. The program is based on the concept that each tenant must qualify with the local housing authority for a subsidy based on the individual needs. HUD assess the market area and sets maximum rental rates that are available for subsidy. The tenant then may get all or a portion of that amount as a subsidy. Lastly, the tenant is barred from paying more than the HUD maximum so that the landlord that accepts Section 8 can not charge more. Example - if the HUD max rent is $600 monthly, and the tenant gets a $500 voucher, then the tenant can only pay $100. The voucher is reduced if the rent is less so that the tenant will always pay $100. Guess what most landlords do?
3.Tenants are free to rent anywhere from any landlord that accept vouchers. Accepting vouchers also requires the landlord to accept certain HUD policies
4. Most Section 8 vouchers are less than 100% but they do represent a major portion of the rent.
5. Due to Congress inability to pass a budget, HUD has been operating under a continuing resolution for over the past seven years. This means that there has been little expansion of the voucher program over this time and most parts of the country do not have vouchers available. In some areas of the country, waiting list for voucher applicants exceed three years.
How to proceed- Since it sound like you have experience with HUD, you are probably aware that each unit and the property as a whole needs to be inspected prior to a tenant be able to rent. I would focus on trying to "steal" tenants by offering them incentives that might get you existing Section 8 residents with vouchers. You can not offer them money but you could offer to help them move for example. Inside the Section 8 program there are some underserved residents. By this I mean that while there might not be any vouchers available for most residents, some individuals may qualify under a different part of the ACT. For example, we recently received a number of vouchers for a SRO (single resident occupant) project that serve the homeless transitioning to housing.
When you talk with the Housing Authority, make sure you ask the right questions otherwise you might end up in HUD hell. Many of the HUD programs are very specialized and most departments do not know much outside their own program specialty. Getting to the right program requires a lot of research. Keep in mind that the programs are for the most part national and that the local office may not even be aware of possible alternatives. Conversely, many existing programs are not currently funded even though they are on the books as active.
Finally, I have been too long winded, but given your purchase price and proposed renovation, you might consider applying for tax credits (LIHTC). This would provide for a significant equity contribution,