I know the development, have been past it several times in the past couple of months and walked around the site with the owners about a month ago.
It is currently under construction, the location has a lot of promise and I was told that sales are going very well. I don't know how they can give a rental guarantee before delivery - they obviously can't be renting it out if it's not finished so I think the term "rental guarantee" must be a misnomer - if they really are offering that then it must be some form of a cash back discount paid to the investor over the last year of construction but I can't be sure as this is the first time I've heard of it.
I don't see what the benefit is as normally this type of offer only done when the investor is paying for the property with a mortgage althoguh I'm sure if they are doing that there must be a reason behind it.
As you know, I'm a developer in Natal so we are technically working on "competing developments" although in reality we are building totally different types with totally different market segments - they are targetting the higher end, holiday home clients whereas we promote pure investment product geared towards the medium and medium-low Brazilian market so I was just visiting out of professional courtesy which is why we never discussed the payment plans, rental guarantee's, cash-backs, etc.
Of the holiday home developments currently being built in the state of Rio Grande do Norte, this one is by no means the cheapest but in my professional opinion it is probably one of the nicest and the price is needed to differentiate from the rest of the developments claiming to be luxury.