A real-estate investor yesterday sued Andrew Collins, who owns a series of commercial parcels along Dorchester Avenue in the area of D Street, over the more than $6 million he says Collins and two of his LLCs now owe on a promissory note in default since the spring.

Through his Ayoba Capital, Peter Russell alleges that Collins - brother of state Sen. Nick Collins - solicited him to invest in two projects: One to do something about all the commercial property Collins has amassed along Dorchester Avenue - the "Dot Ave. Assemblage Project," - the other "a group of multi-family homes" Collins had bought intending to fix them up and then sell them, some after converting them from apartments to condos, through two dozen different LLCs that Collins controls.

In his suit, filed in Suffolk Superi

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